Update readme.md

readme.md

@@ -8,6 +8,7 @@ Getting started? Play directly with the Babylon.js API using our [playground](ht
 [![Percentage of issues still open](https://isitmaintained.com/badge/open/babylonJS/babylon.js.svg)](https://isitmaintained.com/project/babylonJS/babylon.js "Percentage of issues still open")
 [![Build Size](https://img.badgesize.io/BabylonJS/Babylon.js/master/dist/preview%20release/babylon.js.svg?compression=gzip)](https://img.badgesize.io/BabylonJS/Babylon.js/master/dist/preview%20release/babylon.js.svg?compression=gzip)
 [![Twitter](https://img.shields.io/twitter/follow/babylonjs.svg?style=social&label=Follow)](https://twitter.com/intent/follow?screen_name=babylonjs)
+![Discourse users](https://img.shields.io/discourse/users?server=https%3A%2F%2Fforum.babylonjs.com)
 
 **Any questions?** Here is our official [forum](https://forum.babylonjs.com/).