w: add README-EN.md

README-EN.md

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+# Hydro
+
+![GitHub Workflow Status](https://img.shields.io/github/workflow/status/hydro-dev/hydro/CI)
+![hydrooj](https://img.shields.io/npm/dm/hydrooj)
+![npm](https://img.shields.io/npm/v/hydrooj?label=hydrooj)
+![node-current](https://img.shields.io/node/v/hydrooj)
+![GitHub contributors](https://img.shields.io/github/contributors/hydro-dev/Hydro)
+![GitHub commit activity](https://img.shields.io/github/commit-activity/y/hydro-dev/Hydro)
+
+Hydro is a high-performance online judge system.  
+It is easy to deploy (with install script), light weight and extensible.  
+Also see previous version at [vijos/vj4](https://github.com/vijos/vj4)
+
+[中文](https://hydro.js.org/)  
+
+[Open pre-configured test environment in Gitpod](https://gitpod.io/#https://github.com/hydro-dev/Hydro)  
+
+## Contact US
+
+QQ [3402182471](https://wpa.qq.com/msgrd?v=3&uin=3402182471&site=qq&menu=yes)  
+Hydro QQ Group: 1085853538  
+Discord [Hydro](https://discord.gg/c633mBUJwS)  
+Telegram [@webpack_exports_undefined](https://t.me/webpack_exports_undefined)  
+
+## License
+
+AGPL3
+
+## Thanks to
+
+In dictionary order:
+
+- [Github](https://github.com/) Code hosting and workflow。  
+- [criyle](https://github.com/criyle) Sandbox。  
+- [Vijos](https://github.com/vijos/vj4) UI framework。  

README.md

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 Hydro是一个高效的信息学在线测评系统。特点：易于部署（且提供安装脚本），轻量，功能强大且易于扩展。  
 Also see previous version at [vijos/vj4](https://github.com/vijos/vj4)
 
-[中文文档](https://hydro.js.org/)  
+[中文文档](https://hydro.js.org/)  [English](./README-EN.md)  
 
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