add slack
@@ -3,6 +3,7 @@ ION is a distributed RTC system written by pure go and flutter
[![Build Status](https://travis-ci.com/pion/ion.svg?branch=master)](https://travis-ci.com/pion/ion)
![MIT](https://img.shields.io/badge/License-MIT-yellow.svg)
+[![slack](https://img.shields.io/badge/join-us%20on%20slack-gray.svg?longCache=true&logo=slack&colorB=brightgreen)](https://pion.ly/slack)
## Architecture
