Update avatars.mdx

Author: towneh

docs/avatars.mdx

@@ -51,6 +51,10 @@ If you place your content within a new directory "Assets > _UserContent" the def
 
 ![image](..\static\img\avatars\6.png)
 
+## Materials/Shaders
+- You can jump straight in with the Universal Render Pipeline/Lit shader that comes with Unity 6
+- Otherwise, we have compiled a list of compatiable [Avatar Shaders](avatar-shaders) that you can use.
+
 ## Basis Avatar Setup
 - The steps above should automatically add an Animator component to your Avatar prefab when you pull it into the Scene.
 - On the Parent GameObject of the Avatar, click `Add Component`, and add `Basis Avatar`.