Update README.md

Author: gkorland

README.md

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 # JRedisJSON
 
+[![Mailing List](https://img.shields.io/badge/Mailing%20List-RedisJSON-blue)](https://groups.google.com/forum/#!forum/redisjson)
+[![Gitter](https://badges.gitter.im/RedisLabs/RedisJSON.svg)](https://gitter.im/RedisLabs/RedisJSON?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)
+    
+
 A Java Client Library for [RedisJSON](https://github.com/RedisJSON/RedisJSON)
 
 ## Overview