docs: 新增 Copilot 插件推荐

doc/plugins.md

@@ -4,6 +4,7 @@
 
 <!-- prettier-ignore -->
 - ⭐[IDE Eval Rest](https://www.cnblogs.com/wang-cong/p/15150585.html) - IDEA 无限重置试用插件
+- ⭐[GitHub Copilot](https://plugins.jetbrains.com/plugin/17718-github-copilot)
 - ⭐[.ignore](https://plugins.jetbrains.com/plugin/7495--ignore)
 - ⭐[GitToolBox](https://plugins.jetbrains.com/plugin/7499-gittoolbox)
 - ⭐[Grep Console](https://plugins.jetbrains.com/plugin/7125-grep-console)