add discord chat group in readme

readme-en.md

@@ -208,3 +208,7 @@ go get -u github.com/tal-tech/go-zero
 
 * [Rapid development of microservice systems](https://github.com/tal-tech/zero-doc/blob/main/doc/shorturl-en.md)
 * [Rapid development of microservice systems - multiple RPCs](https://github.com/tal-tech/zero-doc/blob/main/doc/bookstore-en.md)
+
+## 9. Chat group
+
+Join the chat via https://discord.gg/4JQvC5A4Fe