Update README notes

README.md

@@ -13,11 +13,12 @@ Gogs - Go Git Service [![Build Status](https://travis-ci.org/gogits/gogs.svg?bra
 
 ### Important Notes
 
-1. Due to testing purpose, data of [try.gogs.io](https://try.gogs.io) was reset in **Jan 28, 2015** and will reset multiple times after. Please do **NOT** put your important data on the site.
-2. The demo site [try.gogs.io](https://try.gogs.io) is running under `develop` branch.
-3. If you think there are vulnerabilities in the project, please talk privately to **u@gogs.io**. Thanks!
-4. If you're interested in using APIs, we have experimental support with [documentation](https://github.com/gogits/go-gogs-client/wiki).
-5. If your team/company is using Gogs and would like to put your logo on [our website](http://gogs.io), contact us by any means.
+1. **YOU MUST READ [Contributing Code](https://github.com/gogits/gogs/wiki/Contributing-Code) BEFORE START WORKING ON PULL REQUEST**.
+2. Due to testing purpose, data of [try.gogs.io](https://try.gogs.io) was reset in **Jan 28, 2015** and will reset multiple times after. Please do **NOT** put your important data on the site.
+3. The demo site [try.gogs.io](https://try.gogs.io) is running under `develop` branch.
+4. If you think there are vulnerabilities in the project, please talk privately to **u@gogs.io**. Thanks!
+5. If you're interested in using APIs, we have experimental support with [documentation](https://github.com/gogits/go-gogs-client/wiki).
+6. If your team/company is using Gogs and would like to put your logo on [our website](http://gogs.io), contact us by any means.
 
 [简体中文](README_ZH.md)