README.md - Add Gitter chat channel

README.md

@@ -3,6 +3,7 @@
 [![Build Status](https://dev.azure.com/chmorgan/chmorgan/_apis/build/status/chmorgan.sharppcap?branchName=master)](https://dev.azure.com/chmorgan/chmorgan/_build/latest?definitionId=1&branchName=master)
 [![CircleCI](https://circleci.com/gh/chmorgan/sharppcap.svg?style=svg)](https://circleci.com/gh/chmorgan/sharppcap)
 [![Travis-CI](https://travis-ci.com/chmorgan/sharppcap.svg?branch=master)](https://travis-ci.com/chmorgan/sharppcap)
+[![Gitter](https://badges.gitter.im/SharpPcap/community.svg)](https://gitter.im/SharpPcap/community?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)
 
 # sharppcap
 Fully managed, cross platform (Windows, Mac, Linux) .NET library for capturing packets from live and file based devices