You can add menu items to the admin menu by using the example below. This comes in handly when wanting to add a third party package to the admin area.
'admin_menu_items' => [
[
// The slot between menu items.
// Slots 0 - 8 are viewable by editors.
// Slots 9 & 10 are for admins only.
'slot' => 4,
// The parent url
'url' => '/admin/locations',
'parent_title' => 'Locations',
'named_route' => 'neutrino.locations',
// Icons are from FontAwesome using the pro light ( fal ) set.
// You won't need to use the fal class.
'fa-icon' => 'fa-map-marked',
// List any secondary menu items ( dropdown )
'children' => [
[ 'url' => '/admin/locations', 'title' => 'All Locations' ],
[ 'url' => '/admin/location', 'title' => 'Create Location' ],
],
],
],