Update readme

Author: Elchi3

README.md

@@ -2,6 +2,8 @@
 
 This repository contains examples of CSS usage.
 
+The "counter-style-demo" directory contains a demo for the [@counter-style documentation](https://developer.mozilla.org/en-US/docs/Web/CSS/@counter-style). See the live demo [here](https://mdn.github.io/css-examples/counter-style-demo/).
+
 The "editable-examples" directory contains CSS examples that are intended to be embedded in MDN pages as live editable samples.
 
-The "object-fit-gallery" directory contains a fun image gallery that uses <code>object-fit</code> to display the images more nicely, both in thumbnail and full size view. [Run the example live](http://mdn.github.io/object-fit-gallery/).
+The "object-fit-gallery" directory contains a fun image gallery that uses <code>object-fit</code> to display the images more nicely, both in thumbnail and full size view. [Run the example live](http://mdn.github.io/css-examples/object-fit-gallery/).