add game mode config files

app/src/main/AndroidManifest.xml

@@ -92,6 +92,10 @@
                 android:name="android.support.FILE_PROVIDER_PATHS"
                 android:resource="@xml/provider_paths" />
         </provider>
+
+        <meta-data
+            android:name="android.game_mode_config"
+            android:resource="@xml/game_mode_config" />
     </application>
 
 </manifest>

app/src/main/res/xml/game_mode_config.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<game-mode-config
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:supportsBatteryGameMode="false"
+    android:supportsPerformanceGameMode="false"
+    android:allowGameFpsOverride="false"
+    />