docs(readme): archive warning

README.md

@@ -2,6 +2,17 @@
 
 > VS Code plugin for [CSScomb](http://csscomb.com/) — CSS coding style formatter.
 
+## :warning: This plugin is archived
+
+The main package ([`csscomb`](https://github.com/csscomb/csscomb.js)) has no maintainer and does not develop. In this regard, the development of the plugin does not make sense.
+
+Alternatively you can use:
+
+* [`postcss`](https://github.com/postcss/postcss) with similar plugins.
+* [`stylelint`](https://github.com/stylelint/stylelint)
+
+> I'm ready to go back to developing the plugin if the csscomb will develops again.
+
 ## Donation
 
 Do you like this project? Support it by donating, creating an issue or pull request.