Add disclaimer to README

README.md

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 Kubernetes operator to manage [RabbitMQ](https://www.rabbitmq.com/) messaging topologies within a RabbitMQ cluster deployed via the [RabbitMQ Cluster Kubernetes Operator](https://github.com/rabbitmq/cluster-operator/). This repository contains [custom controllers](https://kubernetes.io/docs/concepts/extend-kubernetes/api-extension/custom-resources/#custom-controllers) and [custom resource definitions (CRDs)](https://kubernetes.io/docs/concepts/extend-kubernetes/api-extension/custom-resources/#customresourcedefinitions) enabling a declarative API for RabbitMQ messaging topologies.
 
+**Note:** This project is under active development and is provided as **alpha** software. There is no guarantee of API backwards compatibility, release schedule, or providing support.
+
 ## Quickstart
 
 Before deploying Messaging Topology Operator, you need to have: