Update Readme

README.md

@@ -11,7 +11,7 @@
 - 项目文档  **[docs.DragonOS.org](https://docs.dragonos.org)**
 - 开源论坛  **[bbs.DragonOS.org](https://bbs.dragonos.org)**
 - 开发交流QQ群 **115763565**
- 
+- 代码搜索引擎 [code.DragonOS.org](http://code.dragonos.org) 
 ## 开发环境
 
 GCC>=8.0

README_EN.md

@@ -10,7 +10,8 @@ This project is a operating system running on computer which is in X86_ 64 Archi
 - Home Page  **[DragonOS.org](https://dragonos.org)**
 - Documentation  **[docs.DragonOS.org](https://docs.dragonos.org)**
 - BBS  **[bbs.DragonOS.org](https://bbs.dragonos.org)**
- 
+- QQ group **115763565**
+- code search engine [code.DragonOS.org](http://code.dragonos.org) 
 
 ## Development Environment