Add gitter badge

README.md

@@ -4,6 +4,8 @@
 [![build status](https://travis-ci.com/VSCodium/vscodium.svg?branch=master)](https://travis-ci.com/VSCodium/vscodium) 
 [![current release](https://img.shields.io/github/release/vscodium/vscodium.svg)](https://github.com/vscodium/vscodium/releases)
 [![license](https://img.shields.io/github/license/VSCodium/vscodium.svg)](https://github.com/VSCodium/vscodium/blob/master/LICENSE)
+[![Gitter](https://img.shields.io/gitter/room/vscodium/vscodium.svg)](https://gitter.im/VSCodium/Lobby)
+
 
 ## Table of Contents
 - [Download/Install](#download-install)