Add VRChat and GitHub packages to Unity project

Assets/VRCSDK/Dependencies/VRChat/Editor/ControlPanel/IVRCSdkControlPanelBuilder.cs

@@ -0,0 +1,9 @@
+
+public interface IVRCSdkControlPanelBuilder
+{
+    void ShowSettingsOptions();
+    bool IsValidBuilder(out string message);
+    void ShowBuilder();
+    void RegisterBuilder(VRCSdkControlPanel baseBuilder);
+    void SelectAllComponents();
+}