Add VRChat and GitHub packages to Unity project

Assets/VRCSDK/Sample Assets/Shaders/Mobile/VRChat-Mobile-BumpedMappedSpecular.shader

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+// Unity built-in shader source. Copyright (c) 2016 Unity Technologies. MIT license (see license.txt)
+
+// Simplified Bumped Specular shader. Differences from regular Bumped Specular one:
+// - no Main Color nor Specular Color
+// - specular lighting directions are approximated per vertex
+// - writes zero to alpha channel
+// - Normalmap uses Tiling/Offset of the Base texture
+// - no Deferred Lighting support
+// - no Lightmap support
+// - fully supports only 1 directional light. Other lights can affect it, but it will be per-vertex/SH.
+
+Shader "VRChat/Mobile/Bumped Mapped Specular"
+{
+    Properties
+    {
+        _MainTex ("Base (RGB) Gloss (A)", 2D) = "white" {}
+        _Shininess ("Shininess", Range (0.03, 1)) = 0.078125
+        _SpecColor ("Specular Color", Color) = (1,1,1,1)
+        [NoScaleOffset] _BumpMap ("Normalmap", 2D) = "bump" {}
+    }
+    
+    SubShader
+    {
+        Tags { "RenderType"="Opaque" }
+        LOD 250
+
+        CGPROGRAM
+        #pragma target 3.0
+        #pragma surface surf BlinnPhong exclude_path:prepass exclude_path:deferred noforwardadd noshadow nodynlightmap nolppv noshadowmask
+
+        UNITY_DECLARE_TEX2D(_MainTex);
+        UNITY_DECLARE_TEX2D(_BumpMap);
+        half _Shininess;
+
+        struct Input
+        {
+            float2 uv_MainTex;
+            float4 color : COLOR;
+        };
+
+        void surf (Input IN, inout SurfaceOutput o)
+        {
+            fixed4 tex = UNITY_SAMPLE_TEX2D(_MainTex, IN.uv_MainTex);
+            o.Albedo = tex.rgb * IN.color;
+            o.Gloss = tex.a;
+            o.Alpha = 1.0f;
+            o.Specular = _Shininess;
+            o.Normal = UnpackNormal(UNITY_SAMPLE_TEX2D(_BumpMap, IN.uv_MainTex));
+        }
+        ENDCG
+    }
+
+    Fallback "VRChat/Mobile/Diffuse"
+}