/**
  * Start up
  */
 public static function get_instance()
 {
     if (!isset(self::$_instance)) {
         $c = __CLASS__;
         self::$_instance = new $c();
     }
     return self::$_instance;
 }
function wpwsl_admin_setup()
{
    global $user_level;
    if ($user_level >= 5) {
        require_once 'posttype_wpwsl_template.php';
        $page_title = __('WeChat Subscribers Lite', 'WPWSL');
        $menu_title = __('WeChat Subscribers Lite', 'WPWSL');
        $capability = 'edit_pages';
        $menu_slug = WPWSL_GENERAL_PAGE;
        $function = '';
        $icon_url = WPWSL_PLUGIN_URL . '/img/wpwsl_icon_16.png';
        add_object_page($page_title, $menu_title, $capability, $menu_slug, $function, $icon_url);
        require_once 'class-wpwsl-settings.php';
        require_once 'class-wpwsl-general.php';
        require_once 'class-wpwsl-history.php';
        //Settings
        $settingObject = WPWSL_Settings::get_instance();
        //General
        $generalObject = WPWSL_General::get_instance();
        //History
        $hitsotryObject = WPWSL_History::get_instance();
    }
}