adding documentation for registerRoutes()

lib/public/appframework/app.php

@@ -49,7 +49,19 @@ class App {
 	}
 
 	/**
-	 * This function is to be called
+	 * This function is to be called to create single routes and restful routes based on the given $routes array.
+	 *
+	 * Example code in routes.php of tasks app (it will register two restful resources):
+	 * $routes = array(
+	 *		'resources' => array(
+	 *		'lists' => array('url' => '/tasklists'),
+	 *		'tasks' => array('url' => '/tasklists/{listId}/tasks')
+	 *	)
+	 *	);
+	 *
+	 * $a = new TasksApp();
+	 * $a->registerRoutes($this, $routes);
+	 *
 	 * @param \OC_Router $router
 	 * @param array $routes
 	 */