Update README.md

Author: 4evergr8

README.md

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 * [ascii2d（画师作品，漫画）](https://ascii2d.net/search/url/https://picsum.photos/200/200?random=1)
 * [WAIT（动漫截图）](https://trace.moe/?url=https://picsum.photos/200/200?random=1)
 * [Trace.moe（动漫截图）](https://trace.moe/?url=https://picsum.photos/200/200?random=1)
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+## 编译
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+* 本项目采用GithubAction进行编译
+* Fork或Import本项目,在Action选项卡内运行Build and Release Flutter APK  
+* 等待成功运行完成后在Release里寻找最新测试版并下载对应架构的APK