The content of the plugin development document should be merged into the current repository

[en] The content of the plugin development document should be merged into the current repository
[zh-cn] 插件开发文档的内容应合并到当前存储库中

[en] The currently recommended repository by the official（[babel-handbook](https://github.com/thejameskyle/babel-handbook)） has not been submitted and maintained by developers for a long time
[zh-cn]当前官方推荐的仓库，开发者已经很久没有提交和维护代码了