add IGameApp interface

Blarg.GameFramework/Blarg.GameFramework.csproj

@@ -81,6 +81,7 @@
     <Compile Include="Graphics\Color.cs" />
     <Compile Include="Graphics\Image.cs" />
     <Compile Include="Graphics\ScreenOrientation.cs" />
+    <Compile Include="IGameApp.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildExtensionsPath32)\Microsoft\Portable\$(TargetFrameworkVersion)\Microsoft.Portable.CSharp.targets" />
   <ItemGroup>

Blarg.GameFramework/IGameApp.cs

@@ -0,0 +1,21 @@
+using System;
+using Blarg.GameFramework.Graphics;
+
+namespace Blarg.GameFramework
+{
+	public interface IGameApp
+	{
+		void OnAppGainFocus();
+		void OnAppLostFocus();
+		void OnAppPause();
+		void OnAppResume();
+		bool OnInit();
+		void OnLoad();
+		void OnUnload();
+		void OnLostContext();
+		void OnNewContext();
+		void OnRender(float delta);
+		void OnResize(ScreenOrientation orientation, Rect size);
+		void OnUpdate(float delta);
+	}
+}