Add VRChat and GitHub packages to Unity project

Assets/Udon/Editor/Resources/UdonSettings.uxml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="utf-8"?>
+<engine:UXML
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xmlns:engine="UnityEngine.Experimental.UIElements"
+    xmlns:editor="UnityEditor.Experimental.UIElements"
+    xsi:noNamespaceSchemaLocation="../UIElementsSchema/UIElements.xsd"
+    xsi:schemaLocation="UnityEngine.Experimental.UIElements ../UIElementsSchema/UnityEngine.Experimental.UIElements.xsd">
+
+    <engine:Label text="Settings" name="header" />
+    <engine:ScrollView stretch-content-width="true">
+
+        <engine:VisualElement name="section" />
+       
+    </engine:ScrollView>
+
+</engine:UXML>