Add VRChat and GitHub packages to Unity project

Assets/VRCSDK/Dependencies/VRChat/Scripts/ShaderStripping/StripPostProcessing.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEditor;
+using UnityEditor.Build;
+using UnityEditor.Rendering;
+using UnityEngine;
+
+public class StripPostProcessing : IPreprocessShaders
+{
+    public int callbackOrder => 0;
+
+    public void OnProcessShader(Shader shader, ShaderSnippetData snippet, IList<ShaderCompilerData> data)
+    {
+        if(EditorUserBuildSettings.activeBuildTarget != BuildTarget.Android)
+        {
+            return;
+        }
+
+        string shaderName = shader.name;
+        if(string.IsNullOrEmpty(shaderName) || !shaderName.Contains("PostProcessing"))
+        {
+            return;
+        }
+
+        data.Clear();
+    }
+}

Assets/VRCSDK/Dependencies/VRChat/Scripts/ShaderStripping/StripPostProcessing.cs.meta

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+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
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Assets/VRCSDK/Dependencies/VRChat/Scripts/ShaderStripping/VRC.SDKBase.ShaderStripping.asmdef

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+{
+    "name": "VRCSDK.ShaderStripping",
+    "references": [],
+    "optionalUnityReferences": [],
+    "includePlatforms": [
+        "Editor"
+    ],
+    "excludePlatforms": [],
+    "allowUnsafeCode": false,
+    "overrideReferences": false,
+    "precompiledReferences": [],
+    "autoReferenced": true,
+    "defineConstraints": []
+}

Assets/VRCSDK/Dependencies/VRChat/Scripts/ShaderStripping/VRC.SDKBase.ShaderStripping.asmdef.meta

@@ -0,0 +1,7 @@
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+  externalObjects: {}
+  userData: 
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