Update README.md

Author: andyzhangx

test/e2e/README.md

@@ -2,7 +2,9 @@
 
 ## Run E2E tests Locally
 ### Prerequisite
-Make sure a kubernetes cluster is set up and kubeconfig is under $HOME/.kube/config
+ - Make sure a kubernetes cluster(with version >= 1.13) is set up and kubeconfig is under `$HOME/.kube/config`
+ - Copy out `/etc/kubernetes/azure.json` under one agent node to local machine
+ > For AKS cluster, need to modify `resourceGroup` to the node resource group name inside `/etc/kubernetes/azure.json`
 
 ### Run test
 ```