Add repo deprecation notice

Author: smithad15

Diff for: README.md

@@ -1,3 +1,7 @@
+# ****REPO DEPRECATED****
+
+Please note that this repo has been deprecated. Code and issues are being migrated to a monorepo at https://github.com/angular-redux/platform where we are beginning work on a new and improved v10. To file any new issues or see the state of the current code base, we would love to see you there! Thanks for your support!
+
 # Example App: Zoo Animals
 
 [![CircleCI](https://circleci.com/gh/angular-redux/example-app.svg?style=svg)](https://circleci.com/gh/angular-redux/example-app)