doc: added suggestion for code style

README.md

@@ -388,6 +388,12 @@ Other key features include: Erasure Encoding, JWT security.
 
 This is a super exciting project! And we need helpers and [support](https://www.patreon.com/seaweedfs)!
 
+BTW, We suggest run the code style check script `util/gostd` before you push your branch to remote, it will make SeaweedFS easy to review, maintain and develop:
+
+```
+$ ./util/gostd
+```
+
 [Back to TOC](#table-of-contents)
 
 ## Installation Guide ##