Update README.md to indicate this repo is deprecated (#22)

Author: shrikanthb-zededa

README.md

@@ -1,4 +1,6 @@
-# github.com/zededa/zedcloud-api
+# [DEPRECATED] github.com/zededa/zedcloud-api
+
+This is no longer supported, please use https://github.com/zededa/terraform-provider-zedcloud instead.
 
 zedcloud-api provides the open source API for zedcontrol (zedcloud). Currently, it provides a
 Go-Lang API. Support for API for Python and other languages can be added as needed.