Add VRChat and GitHub packages to Unity project

Assets/Udon/Editor/ProgramSources/UdonAssemblyProgram/UdonAssemblyProgramAssetImporter.cs

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+using System.IO;
+using JetBrains.Annotations;
+using UnityEditor;
+using UnityEditor.Experimental.AssetImporters;
+using UnityEngine;
+
+namespace VRC.Udon.Editor.ProgramSources
+{
+    [ScriptedImporter(1, "uasm")]
+    [UsedImplicitly]
+    public class UdonAssemblyProgramAssetImporter : ScriptedImporter
+    {
+        public override void OnImportAsset(AssetImportContext ctx)
+        {
+            UdonAssemblyProgramAsset udonAssemblyProgramAsset = ScriptableObject.CreateInstance<UdonAssemblyProgramAsset>();
+            SerializedObject serializedUdonAssemblyProgramAsset = new SerializedObject(udonAssemblyProgramAsset);
+            SerializedProperty udonAssemblyProperty = serializedUdonAssemblyProgramAsset.FindProperty("udonAssembly");
+            udonAssemblyProperty.stringValue = File.ReadAllText(ctx.assetPath);
+            serializedUdonAssemblyProgramAsset.ApplyModifiedProperties();
+
+            udonAssemblyProgramAsset.RefreshProgram();
+
+            ctx.AddObjectToAsset("Imported Udon Assembly Program", udonAssemblyProgramAsset);
+            ctx.SetMainObject(udonAssemblyProgramAsset);
+        }
+    }
+}