Add Go Playground (#3)

Author: huan

README.md

@@ -6,6 +6,8 @@
 
 Go Wechaty Starter Project Template that Works Out-of-the-Box
 
+[Go Playground](https://play.golang.org/p/JGw_2TrVQeg): <https://play.golang.org/p/JGw_2TrVQeg>
+
 ## Connecting Chatbots
 
 [![Powered by Wechaty](https://img.shields.io/badge/Powered%20By-Wechaty-brightgreen.svg)](https://github.com/Wechaty/wechaty)