Add quick settings tile (#7)

* Add quick settings tile
* Launch MainActivity on QS_TILE_PREFERENCES
* Show repeater password on tile

mobile/src/main/AndroidManifest.xml

@@ -40,6 +40,15 @@
         </service>
         <service android:name=".TetheringService">
         </service>
+        <service
+            android:name=".TileService"
+            android:icon="@drawable/ic_quick_settings_tile_off"
+            android:label="@string/app_name"
+            android:permission="android.permission.BIND_QUICK_SETTINGS_TILE">
+            <intent-filter>
+                <action android:name="android.service.quicksettings.action.QS_TILE" />
+            </intent-filter>
+        </service>
     </application>
 
-</manifest>
+</manifest>