Add gitter chat (100th commit gg)

README.md

@@ -1,4 +1,5 @@
 [![License: MIT](https://img.shields.io/github/license/mashape/apistatus.svg)](https://github.com/justcallmekoko/ESP32Marauder/blob/master/LICENSE)
+[![Gitter](https://badges.gitter.im/justcallmekoko/ESP32Marauder.png)](https://gitter.im/justcallmekoko/ESP32Marauder)
 <!---[![Build Status](https://travis-ci.com/justcallmekoko/ESP32Marauder.svg?branch=master)](https://travis-ci.com/justcallmekoko/ESP32Marauder)--->
 
 # ESP32 Marauder v0.4.2