Add deprecation notice

Author: markusjwetzel

README.md

@@ -1,5 +1,5 @@
-# React Kickstarter
+# 🚀 React Kickstarter
 
-Create isomorphic/universal React apps extremely simple with no configuration (until you need it).
+> Deprecation Notice: This package is no longer actively maintained and will not receive updates or bug fixes. We recommend transitioning to the latest version of [Driveline](https://www.github.com/examunity/driveline) for continued support and compatibility with future releases.
 
-This project is not production ready yet.
+Create isomorphic/universal React apps extremely simple with no configuration (until you need it).