/**
  * Initialize the plugin by loading admin scripts & styles and adding a
  * settings page and menu.
  *
  * @since     1.0.0
  */
 private function __construct()
 {
     $plugin = Weblator_Charts::get_instance();
     $this->plugin_slug = $plugin->get_plugin_slug();
     // Load admin style sheet and JavaScript.
     add_action('admin_enqueue_scripts', array($this, 'enqueue_admin_styles'));
     add_action('admin_enqueue_scripts', array($this, 'enqueue_admin_scripts'));
     // Add the options page and menu item.
     add_action('admin_menu', array($this, 'add_plugin_admin_menu'));
 }