Merge pull request #42 from walletiger/patch-1

Update who_is_using_xmake.md

zh-cn/about/who_is_using_xmake.md

@@ -22,3 +22,4 @@
 | [fasiondog](https://github.com/fasiondog) | [Hikyuu Quant Framework](https://github.com/fasiondog/hikyuu) 基于C++/Python的开源量化交易研究框架 | xmake 的简洁高效是C/C++跨平台工程的解放 |
 | [KnightJun](https://github.com/knightjun) | [BingW](https://github.com/knightjun/BingW)(bing wallpaper) | xmake is an excellent, simple, easy-to-use and powerful build tool.
 | [Phate6660](https://github.com/Phate6660) | [cppfetch](https://github.com/Phate6660/cppfetch) (info fetch tool) | I tried this out after seeing [this](https://github.com/xmake-io/xmake/wiki/C-and-Cplusplus-build-system,-I-use-xmake), and after using it I loved it enough that I replaced meson with this!
+|walletiger | ERTC - an easy and efficient cross platform RTC project | 个人项目，简单易用跨平台 兼容 webrtc 标准的 SFU及前端通信组件 ， xmake + tbox 提供了优秀的跨平台编译和底层库支持|