add docsify auth plugin (#296)

README.md

@@ -268,6 +268,7 @@ A curated list of awesome things related to [docsify](https://docsify.js.org)
 - [docsify-navbar-fixed](https://github.com/LIGMATV/docsify-navbar-fixed) - A new always on top customizable and pretty navigation bar for your docs.
 - [docsify-vite-coverpage](https://github.com/LIGMATV/docsify-vite-coverpage) - A new responsive vite-like coverpage for your docs.
 - [docsify-dark-switcher](https://github.com/LIGMATV/docsify-dark-switcher) - Easily switch toggle to light and dark theme for your Docsify, customizable and works in any CSS themes.
+- [docsify-auth](https://github.com/mg0324/docsify-auth) - A docsify plugin for support page auth with config.
 
 ## Themes