How to add custom role in wordpress?

        add_role( 'test', 'Test Role', array(
		'read' => true, // True allows that capability
		'edit_posts' => true, // Allows user to edit their own posts
		'publish_posts'=>true, //Allows the user to publish, otherwise posts stays in draft mode
		'edit_published_posts'=>true,
		'upload_files'=>true,
		'delete_published_posts'=>true,
	));