code: protected function registerEngines()
      {
          $app = $this->app;
          $config = $app['config'];
          $resolver = $app['view.engine.resolver'];
  
          if ($config['markdown.tags']) {
              $this->registerBladeEngine($resolver);
          }
  
          if ($config['markdown.views']) {
              $this->registerMarkdownEngine($resolver);
              $this->registerMarkdownPhpEngine($resolver);
              $this->registerMarkdownBladeEngine($resolver);
          }
      }
docs: Register the service provider engines.
  
  @return void