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');