To show discount rule name in admin panel

Display the name of the discount rule in the admin panel.

add_action('admin_menu', function () {
        if (!is_admin()) return;
	if(class_exists('\Wdr\App\Router')){
		$admin = \Wdr\App\Router::$admin;
		global $submenu;
            add_submenu_page(
                'woocommerce',
                __('Woo Discount Rules', 'woo-discount-rules'),
                __('Woo Discount Rules', 'woo-discount-rules'),
                'manage_woocommerce', WDR_SLUG,
                array($admin, 'adminTabs')
            );
	}   
});