add keep up to date option in the menu

res/menu/file_actions_menu.xml

@@ -30,6 +30,7 @@
     <item 	android:id="@+id/action_move"					android:title="@string/actionbar_move"				android:icon="@android:drawable/ic_menu_set_as"					android:orderInCategory="1" />
     <item 	android:id="@+id/action_remove_file"			android:title="@string/common_remove"				android:icon="@android:drawable/ic_menu_delete"					android:orderInCategory="1" />
     <item 	android:id="@+id/action_send_file"				android:title="@string/actionbar_send_file"			android:icon="@android:drawable/ic_menu_set_as"					android:orderInCategory="1" />
+    <item 	android:id="@+id/action_favourite_file"			android:title="@string/fd_keep_in_sync"		    	android:icon="@android:drawable/ic_menu_set_as"					android:orderInCategory="1" />
     <item 	android:id="@+id/action_see_details"			android:title="@string/actionbar_see_details"		android:icon="@android:drawable/ic_menu_info_details"			android:orderInCategory="1" />
 
 </menu>