Inform users of move

Signed-off-by: Chuck Ha <[email protected]>

Author: chuckha

README.md

@@ -1,3 +1,8 @@
+# ⚠️ This code has moved
+
+This repo is only accepting bug fixes for the code that exists here. All new development is being done in the
+[cluster-api](https://github.com/kubernetes-sigs/cluster-api/tree/master/bootstrap/kubeadm) repository.
+
 # Cluster API bootstrap provider kubeadm
 ## What is the Cluster API bootstrap provider kubeadm?