feat: add stylus.md cheatsheet.

Author: jaywcjlove

README.md

@@ -34,6 +34,7 @@ Quick Reference
 [Electron](./docs/electron.md)<!--rehype:style=background: rgb(0 72 153/var(\-\-bg\-opacity));-->
 [Emmet](./docs/emmet.md)<!--rehype:style=background: rgb(122 203 23/var(\-\-bg\-opacity));-->
 [Styled Components](./docs/styled-components.md)<!--rehype:style=background: rgb(221 60 184/var(\-\-bg\-opacity));-->
+[Stylus](./docs/stylus.md)<!--rehype:style=background: rgb(109 161 63/var(\-\-bg\-opacity));-->
 [HTML](./docs/html.md)<!--rehype:style=background: rgb(228 77 39/var(\-\-bg\-opacity));-->
 [JavaScript](./docs/javascript.md)<!--rehype:style=background: rgb(203 183 31/var(\-\-bg\-opacity));-->
 [Jest](./docs/jest.md)<!--rehype:style=background: rgb(153 66 91/var(\-\-bg\-opacity));-->

docs/lessjs.md

@@ -1,7 +1,7 @@
 Less 备忘清单
 ===
 
-本备忘单旨在快速理解 [Less](https://github.com/lerna/lerna) 所涉及的主要概念，显示了它的常用方法使用清单。
+本备忘单旨在快速理解 [Less](https://github.com/less/less.js) 所涉及的主要概念，显示了它的常用方法使用清单。
 
 入门
 ---
@@ -715,4 +715,5 @@ each(range(4), {
 
 - [Less.js 官网](http://lesscss.org) _(lesscss.org)_
 - [CSS 备忘清单](./css.md) _(jaywcjlove.github.io)_
+- [Stylus 备忘清单](./stylus.md) _(jaywcjlove.github.io)_
 - [在线编译预览](http://lesscss.org/less-preview/#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) _(lesscss.org)_