add link to edit content in admin top bar
That looks like the "shortcuts" menu tab which comes natively in a D8 installation but if you're looking to add your own custom shortcut menu (&amp; menu items) you might want to look into the hook_toolbar: https://api.drupal.org/api/drupal/core!modules!toolbar!toolbar.api.php/function/hook_toolbar/8.2.x 

You can build a quick custom module to establish your own links and configurations. Hope I answered your question!