function add_roles() {
  add_role( 'bronze',
            'Bronze',
             array( 'read' => true,
                    'edit_posts' => false,
            'delete_posts' => false, ));
  add_role( 'silver',
            'Silver',
             array( 'read' => true,
                'edit_posts' => true,
                'delete_posts' => false, ));
  dd_role( 'gold',
           'Gold',
            array( 'read' => true,
                   'edit_posts' => true,
           'delete_posts' => false, ));
}
// add custom roles
add_action('wp_footer', 'add_roles');