Update external tutorials list

Author: De-Panther

Documentation/README.md

@@ -10,6 +10,7 @@ This folder contains some docs and manuals, to help you use WebXR Export and Web
 - [How To Setup WebXR with Oculus Quest](https://www.youtube.com/watch?v=nPAHZ9Rm8d4) by FusedVR
 - [How To Use VRTK & Tillia with WebXR Export](https://www.youtube.com/watch?v=RKpa2tDvNiQ) by FusedVR
 - [Unity XR Hands + WebXR: How To](https://www.youtube.com/watch?v=tASwwuMPtF8) by De-Panther (Also includes importing from OpenUPM and adding Spectator Camera)
+- [How to use WebXR with Unity - January 2024 Edition](https://www.youtube.com/watch?v=4wQG8_pb3cs) by De-Panther
 
 ## Written tutorials