Add discord, and license widget to README.md

Author: mehr74

README.md

@@ -19,4 +19,9 @@
 
   <br>
   <br>
+[![discord](https://img.shields.io/discord/747933592273027093?label=discord)](https://discord.gg/coder)
+[![codecov](https://codecov.io/gh/coder/coder/branch/main/graph/badge.svg?token=TNLW3OAP6G)](https://codecov.io/gh/coder/coder)
+[![release](https://img.shields.io/github/v/release/coder/coder)](https://github.com/coder/coder/releases/latest)
+[![godoc](https://pkg.go.dev/badge/github.com/coder/coder.svg)](https://pkg.go.dev/github.com/coder/coder)
+[![license](https://img.shields.io/github/license/optiop/postgres-grafana-on-ecs)](./LICENSE)
 </div>