doc: add README.md (#677)

README.md

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-# Cyclone
+# Cyclone
+
+<h1 align="center">
+	<br>
+	<img width="400" src="docs/images/logo.jpeg" alt="cyclone">
+	<br>
+	<br>
+</h1>
+
+Cyclone is a cloud native workflow engine not only for CI/CD pipelines, but also for general workflows. It defines workflow by assembling workflow stages as DAG. As Cyclone totally bases on Kubernetes, it can be easily deployed and used.
+
+Cyclone defines each workflow stage as a pod, and assemble them to workflow by capturing dependencies between stages as DAG. 
+
+## Features
+- **Kubernetes Native**: Totally based on Kubernetes without any other dependencies..
+- **Workflow Engine**: Supports CI/CD pipelines, AI pipelines and any other general workflows.
+- **DAG**: Cyclone supports any DAG workflow.
+- **Pluggability**: Cyclone can easily integrate with external systems, such as SCM, Docker Registry, S3, etc.
+- **Triggers**: Workflow can be triggered by time schedule, webhooks.
+- **Controllable**: Execution of workflow can be paused, resumed or cancelled.
+- **Multi-Tenant**: Cyclone supports multi-tenant.
+- **Garbadge Collection**: Cleanup after workflow finished and results collected.
+
+## Quick Start
+
+Build images
+```bash
+$ make container
+```
+
+Deploy to Kubernetes cluster
+```bash
+$ kubectl create -f manifests/cyclone.yaml
+```
+
+## Community
+
+- **Slack**: Join [Cyclone Community](https://caicloud-cyclone.slack.com/join/signup) for disscussions and ask questions.
+
+## Roadmap
+
+[Cyclone Roadmap](./docs/ROADMAP.md)
+
+## History
+
+Before v0.9.0, Cyclone focuses on CI/CD pipelines and run pipelines in both Docker and Kubernetes.
+
+From v0.9.0, Cyclone has been totally refactored, new Cyclone not only aims at CI/CD pipeline, but also provides a general workflow engine. Compared with previous one, it's more flexible and powerful.