New quick start (#358)

* Simplify README
* new, simpler, installation process
* move more complex stuff to the contributor's guide

CONTRIBUTING.md

@@ -21,6 +21,50 @@ list][rmq-users]. This would include YAML manifests, Kubernetes version,
 RabbitMQ Operator logs and any other relevant information that might help
 to diagnose the problem.
 
+## Makefile
+
+This project contains a Makefile to perform common development operation. If you want to build, test or deploy a local copy of the repository, keep reading.
+
+### Required environment variables
+
+The following environment variables are required by many of the `make` targets to access a custom-built image:
+
+- DOCKER_REGISTRY_SERVER: URL of docker registry containing the Operator image (e.g. `registry.my-company.com`)
+- OPERATOR_IMAGE: path to the Operator image within the registry specified in DOCKER_REGISTRY_SERVER (e.g. `rabbitmq/cluster-operator`). Note: OPERATOR_IMAGE should **not** include a leading slash (`/`)
+
+When running `make deploy-dev`, additionally:
+
+- DOCKER_REGISTRY_USERNAME: Username for accessing the docker registry
+- DOCKER_REGISTRY_PASSWORD: Password for accessing the docker registry
+- DOCKER_REGISTRY_SECRET: Name of Kubernetes secret in which to store the Docker registry username and password
+
+#### Make targets
+
+- **controller-gen** Download controller-gen if not in $PATH
+- **deploy** Deploy operator in the configured Kubernetes cluster in ~/.kube/config
+- **deploy-dev** Deploy operator in the configured Kubernetes cluster in ~/.kube/config, with local changes
+- **deploy-kind** Load operator image and deploy operator into current KinD cluster
+- **deploy-sample** Deploy RabbitmqCluster defined in config/sample/base
+- **destroy** Cleanup all operator artefacts
+- **kind-prepare** Prepare KinD to support LoadBalancer services, and local-path StorageClass
+- **kind-unprepare** Remove KinD support for LoadBalancer services, and local-path StorageClass
+- **list** List Makefile targets
+- **run** Run operator binary locally against the configured Kubernetes cluster in ~/.kube/config
+- **unit-tests** Run unit tests
+- **integration-tests** Run integration tests
+- **system-tests** Run end-to-end tests against Kubernetes cluster defined in ~/.kube/config
+
+### Testing
+
+Before submitting a pull request, ensure all local tests pass:
+- `make unit-tests`
+- `make integration-tests`
+
+<!-- TODO: generalise deployment process: make DOCKER_REGISTRY_SECRET and DOCKER_REGISTRY_SERVER configurable -->
+Also, run the system tests with your local changes against a Kubernetes cluster:
+- `make deploy-dev`
+- `make system-tests`
+
 ## Pull Requests
 
 RabbitMQ Operator project uses pull requests to discuss, collaborate on and accept code contributions.
@@ -40,6 +84,10 @@ Here's the recommended workflow:
 If what you are going to work on is a substantial change, please first
 ask the core team for their opinion on the [RabbitMQ users mailing list][rmq-users].
 
+### Code Conventions
+
+This project follows the [Kubernetes Code Conventions for Go](https://github.com/kubernetes/community/blob/master/contributors/guide/coding-conventions.md#code-conventions), which in turn mostly refer to [Effective Go](https://golang.org/doc/effective_go.html) and [Go Code Review Comments](https://github.com/golang/go/wiki/CodeReviewComments). Please ensure your pull requests follow these guidelines.
+
 ## Code reviews
 
 All submissions, including submissions by project members, require review. We

README.md

@@ -1,35 +1,26 @@
 # RabbitMQ Cluster Kubernetes Operator
 
-Manage [RabbitMQ](https://www.rabbitmq.com/) clusters deployed to [Kubernetes](https://kubernetes.io/). The RabbitMQ Cluster Kubernetes Operator has been built using the [Kubebuilder](https://github.com/kubernetes-sigs/kubebuilder) implementation of the [operator pattern](https://coreos.com/blog/introducing-operators.html). This repository contains a [custom controller](https://kubernetes.io/docs/concepts/extend-kubernetes/api-extension/custom-resources/#custom-controllers) and [custom resource definition (CRD)](https://kubernetes.io/docs/concepts/extend-kubernetes/api-extension/custom-resources/#customresourcedefinitions) designed for the lifecyle (creation, upgrade, graceful shutdown) of a RabbitMQ cluster.
+Kubernetes operator to deploy and manage [RabbitMQ](https://www.rabbitmq.com/) clusters. This repository contains a [custom controller](https://kubernetes.io/docs/concepts/extend-kubernetes/api-extension/custom-resources/#custom-controllers) and [custom resource definition (CRD)](https://kubernetes.io/docs/concepts/extend-kubernetes/api-extension/custom-resources/#customresourcedefinitions) designed for the lifecyle (creation, upgrade, graceful shutdown) of a RabbitMQ cluster.
 
 **Note**: this repository is under active development and is provided as **beta** software. Official support for this software is not provided; if you encounter any issues running this software, please feel free to [contribute to the project](#contributing).
 
-## Supported Versions
-
-The operator deploys RabbitMQ `3.8.8` by default, and supports versions from `3.8.4` upwards. The operator requires a Kubernetes cluster of `1.16` or above.
-
-## Versioning
-
-RabbitMQ Cluster Kubernetes Operator follows non-strict [semver](https://semver.org/).
-
-[The versioning guidelines document](version_guidelines.md) contains guidelines
-on how we implement non-strict semver. The version number MAY or MAY NOT follow the semver rules. Hence, we highly recommend to read
-the release notes to understand the changes and their potential impact for any release.
-
 ## Quickstart
 
-### Deploying on KinD
+If you have a running Kubernetes cluster and `kubectl` configured to access it, run the following command to install the operator:
+
+```bash
+kubectl apply -f https://github.com/rabbitmq/cluster-operator/releases/latest/download/cluster-operator.yml
+```
 
-The easiest way to set up a local development environment for running the RabbitMQ operator is using [KinD](https://kind.sigs.k8s.io/):
+Then you can deploy a RabbitMQ cluster:
 
-1. Follow the KinD [installation guide](https://kind.sigs.k8s.io/#installation-and-usage) to deploy a Kubernetes cluster
-1. Ensure that all [Required environment variables](#required-environment-variables) are set in your environment
-1. Run `make deploy-kind`
-1. Check that the operator is running by running `kubectl get all --namespace=rabbitmq-system`
-1. Deploy a `RabbitmqCluster` custom resource. Refer to the [example YAML](./cr-example.yaml) and [documentation](https://docs.pivotal.io/rabbitmq-kubernetes/0-7/using.html#configure) for available CR attributes
-    1. Due to resource limitations on your Docker daemon, the Kubernetes might not be able to schedule all `RabbitmqCluster` nodes. Either [increase your Docker daemon's resource limits](https://docs.docker.com/docker-for-mac/#resources) or deploy the `RabbitmqCluster` custom resource with `resources: {}` to remove default `memory` and `cpu` resource settings.
-    1. If you set the `serviceType` to `LoadBalancer`, run `make kind-prepare` to deploy a [MetalLB](https://metallb.universe.tf/) load balancer. This will allow the operator to complete the `RabbitmqCluster` provisioning by assign an arbitrary local IP address to the cluster's client service. Proper [network configuration](https://metallb.universe.tf/installation/network-addons/) is required to route traffic via the assigned IP address.
+```bash
+kubectl apply -f https://raw.githubusercontent.com/rabbitmq/cluster-operator/main/docs/examples/hello-world/rabbitmq.yaml
+```
 
+<p align="center">
+  <img width="100%" src="./docs/demos/installation.svg">
+</p>
 
 ## Documentation
 
@@ -46,54 +37,23 @@ In addition, a number of [examples](./docs/examples) can be found in this reposi
 The doc guides are open source. The source can be found in the [RabbitMQ website repository](https://github.com/rabbitmq/rabbitmq-website/)
 under `site/kubernetes`.
 
+## Supported Versions
 
-## Makefile
-
-#### Required environment variables
-
-- DOCKER_REGISTRY_SERVER: URL of docker registry containing the Operator image (e.g. `registry.my-company.com`)
-- OPERATOR_IMAGE: path to the Operator image within the registry specified in DOCKER_REGISTRY_SERVER (e.g. `rabbitmq/cluster-operator`). Note: OPERATOR_IMAGE should **not** include a leading slash (`/`)
-
-When running `make deploy-dev`, additionally:
+The operator deploys RabbitMQ `3.8.8` by default, and supports versions from `3.8.4` upwards. The operator requires Kubernetes `1.16` or newer.
 
-- DOCKER_REGISTRY_USERNAME: Username for accessing the docker registry
-- DOCKER_REGISTRY_PASSWORD: Password for accessing the docker registry
-- DOCKER_REGISTRY_SECRET: Name of Kubernetes secret in which to store the Docker registry username and password
+## Versioning
 
-#### Make targets
+RabbitMQ Cluster Kubernetes Operator follows non-strict [semver](https://semver.org/).
 
-- **controller-gen** Download controller-gen if not in $PATH
-- **deploy** Deploy operator in the configured Kubernetes cluster in ~/.kube/config
-- **deploy-dev** Deploy operator in the configured Kubernetes cluster in ~/.kube/config, with local changes
-- **deploy-kind** Load operator image and deploy operator into current KinD cluster
-- **deploy-sample** Deploy RabbitmqCluster defined in config/sample/base
-- **destroy** Cleanup all operator artefacts
-- **kind-prepare** Prepare KinD to support LoadBalancer services, and local-path StorageClass
-- **kind-unprepare** Remove KinD support for LoadBalancer services, and local-path StorageClass
-- **list** List Makefile targets
-- **run** Run operator binary locally against the configured Kubernetes cluster in ~/.kube/config
-- **unit-tests** Run unit tests
-- **integration-tests** Run integration tests
-- **system-tests** Run end-to-end tests against Kubernetes cluster defined in ~/.kube/config
+[The versioning guidelines document](version_guidelines.md) contains guidelines
+on how we implement non-strict semver. The version number MAY or MAY NOT follow the semver rules. Hence, we highly recommend to read
+the release notes to understand the changes and their potential impact for any release.
 
 ## Contributing
 
 This project follows the typical GitHub pull request model. Before starting any work, please either comment on an [existing issue](https://github.com/rabbitmq/cluster-operator/issues), or file a new one.
 
-### Testing
-
-Before submitting a pull request, ensure all local tests pass:
-- `make unit-tests`
-- `make integration-tests`
-
-<!-- TODO: generalise deployment process: make DOCKER_REGISTRY_SECRET and DOCKER_REGISTRY_SERVER configurable -->
-Also, run the system tests with your local changes against a Kubernetes cluster:
-- `make deploy-dev`
-- `make system-tests`
-
-### Code Conventions
-
-This project follows the [Kubernetes Code Conventions for Go](https://github.com/kubernetes/community/blob/master/contributors/guide/coding-conventions.md#code-conventions), which in turn mostly refer to [Effective Go](https://golang.org/doc/effective_go.html) and [Go Code Review Comments](https://github.com/golang/go/wiki/CodeReviewComments). Please ensure your pull requests follow these guidelines.
+Please read [contribution guidelines](CONTRIBUTING.md) if you are interested in contributing to this project.
 
 ## License
 
@@ -102,4 +62,3 @@ This project follows the [Kubernetes Code Conventions for Go](https://github.com
 ## Copyright
 
 Copyright 2020 VMware, Inc. All Rights Reserved.
-