doc: Update README.

Author: freezy

README.md

@@ -1,7 +1,11 @@
 # Visual Pinball Engine - HDRP Package
 
+[![UPM Package](https://img.shields.io/npm/v/org.visualpinball.engine.unity.hdrp?label=org.visualpinball.engine.unity.hdrp&registry_uri=https://registry.visualpinball.org&color=%2333cf57&logo=unity&style=flat)](https://registry.visualpinball.org/-/web/detail/org.visualpinball.engine.unity.hdrp)
+
 *High Definition Render Pipeline support for the Visual Pinball Engine.*
 
+---
+
 This repository is an [UPM package](https://docs.unity3d.com/Manual/CustomPackages.html) for Unity's [HDRP](https://docs.unity3d.com/Packages/[email protected]/manual/index.html).
 
 ## Dependency Graph