Add deprecation notice

Author: harshavardhana

README.md

@@ -1,3 +1,13 @@
+# ⛔️ DEPRECATED
+
+**This repository is no longer maintained.**. No new features or bug fixes will be added here. 
+
+All paying customers do get access to enterprise version of kes, please open a [SUBNET](https://subnet.min.io) 
+issue to discuss further.
+
+MinIO also now ships [MinKMS AiStor Key Manager](https://min.io/docs/aistor-custom/key-manager/) is a fully 
+featured key manager optimized to be used with [MinIO AiStor](https://min.io/download?view=aistor-custom)
+
 <p align="center">
   <img src='.github/logo.svg?sanitize=true' width='55%'>
 </p>