Update README.md (#241)

Added Graduation Criteria section

Author: runakash

README.md

@@ -13,7 +13,9 @@
 [![Go Report Card](https://goreportcard.com/badge/github.com/aws/aws-cloud-map-mcs-controller-for-k8s)](https://goreportcard.com/report/github.com/aws/aws-cloud-map-mcs-controller-for-k8s)
 
 ## Introduction
-The AWS Cloud Map Multi-cluster Service Discovery Controller for Kubernetes (K8s) implements the Kubernetes [KEP-1645: Multi-Cluster Services API](https://github.com/kubernetes/enhancements/tree/master/keps/sig-multicluster/1645-multi-cluster-services-api) and [KEP-2149: ClusterId for ClusterSet identification](https://github.com/kubernetes/enhancements/tree/master/keps/sig-multicluster/2149-clusterid), which allows services to communicate across multiple clusters. The implementation relies on [AWS Cloud Map](https://aws.amazon.com/cloud-map/) for enabling cross-cluster service discovery.
+The AWS Cloud Map Multi-cluster Service Discovery Controller for Kubernetes (K8s) implements the Kubernetes [KEP-1645: Multi-Cluster Services API](https://github.com/kubernetes/enhancements/tree/master/keps/sig-multicluster/1645-multi-cluster-services-api) and [KEP-2149: ClusterId for ClusterSet identification](https://github.com/kubernetes/enhancements/tree/master/keps/sig-multicluster/2149-clusterid), which allows services to communicate across multiple clusters. The implementation relies on [AWS Cloud Map](https://aws.amazon.com/cloud-map/) for enabling cross-cluster service discovery. The current version `v0.3.0` is in *Alpha* phase, checkout the [Graduation Criteria](#graduation-criteria) for the next steps.
+
+We also have detailed [step-by-step setup guide](https://aws.github.io/aws-cloud-map-mcs-controller-for-k8s/)!
 
 ## Installation
 
@@ -163,6 +165,16 @@ To install from `latest` tag run the following command.
 kubectl apply -k "github.com/aws/aws-cloud-map-mcs-controller-for-k8s/config/controller_install_latest"
 ```
 
+## Graduation Criteria
+
+### Alpha -> Beta Graduation
+* Implement the [resiliency milestone](https://github.com/aws/aws-cloud-map-mcs-controller-for-k8s/milestone/3).
+
+### Beta -> GA Graduation
+* Scalability/performance testing.
+* Implement the [observability and deployment milestone](https://github.com/aws/aws-cloud-map-mcs-controller-for-k8s/milestone/6).
+* [KEP-1645: Multi-Cluster Services API](https://github.com/kubernetes/enhancements/tree/master/keps/sig-multicluster/1645-multi-cluster-services-api) and [KEP-2149: ClusterId for ClusterSet identification](https://github.com/kubernetes/enhancements/tree/master/keps/sig-multicluster/2149-clusterid) are Beta or GA. 
+
 ## Slack community
 We have an open Slack community where users may get support with integration, discuss controller functionality and provide input on our feature roadmap. https://awsappmesh.slack.com/#k8s-mcs-controller
 Join the channel with this [invite](https://join.slack.com/t/awsappmesh/shared_invite/zt-dwgbt85c-Sj_md92__quV8YADKfsQSA).