Adding link to PostCSS (#472)

ThomasLandauer · web-flow · commit 528af4c30bef · 2024-01-29T14:49:02.000-05:00
diff --git a/README.md b/README.md
@@ -12,6 +12,8 @@
   <h1>PostCSS CLI</h1>
 </div>
 
+PostCSS CLI is a command line interface for [PostCSS](https://postcss.org/)
+
 <h2 align="center">Install</h2>
 
 ```bash
