Update README.md

Author: bitwiseman

README.md

@@ -4,6 +4,7 @@
 [![Changelog](https://img.shields.io/github/v/tag/jenkinsci/github-branch-source-plugin?label=changelog)](https://github.com/jenkinsci/github-branch-source-plugin/releases)
 [![Jenkins Plugin Installs](https://img.shields.io/jenkins/plugin/i/github-branch-source?color=blue)](https://plugins.jenkins.io/github-branch-source)
 [![Contributors](https://img.shields.io/github/contributors/jenkinsci/github-branch-source-plugin.svg)](https://github.com/jenkinsci/github-branch-source-plugin/contributors)
+[![Join the chat at https://gitter.im/jenkinsci/github-branch-source-plugin](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/jenkinsci/github-branch-source-plugin?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 
 ## Introduction
 The GitHub Branch Source plugin allows you to create a new project based on the repository structure from one or more