docs: add local development

[CI SKIP]

README.md

@@ -29,6 +29,7 @@ The Gogs (`/gɑgz/`) project aims to build a simple, stable and extensible self-
 - Want to try it before doing anything else? Do it [online](https://try.gogs.io/gogs/gogs)!
 - Having trouble? Help yourself with [troubleshooting](https://gogs.io/docs/intro/troubleshooting.html) or ask questions on [user forum](https://discuss.gogs.io/).
 - Want to help with localization? Check out the [localization documentation](https://gogs.io/docs/features/i18n.html).
+- Ready to get hands dirty? Read [our guide](docs/local_development.md) to set up your development environment.
 
 ## Features
 

README_ZH.md

@@ -13,6 +13,7 @@ Gogs（`/gɑgz/`）项目旨在打造一个以最简便的方式搭建简单、
 - 想要先睹为快？直接去[在线体验](https://try.gogs.io/gogs/gogs)吧！
 - 使用过程中遇到问题？尝试[故障排查](https://gogs.io/docs/intro/troubleshooting.html)或者前往[用户论坛](https://discuss.gogs.io/)获取帮助
 - 希望帮助多国语言的翻译吗？请查看[本地化文档](https://gogs.io/docs/features/i18n.html)
+- 准备搞点事情？请阅读[开发指南](docs/local_development.md)配置开发环境
 
 ## 主要特性