smsplatform-1.0.x-dev/modules/smsplatform_user/smsplatform_user.links.menu.yml

smsplatform_user.options:
  title: 'User SMS settings'
  description: 'Edit options for user integration with SMS Platform.'
  route_name: smsplatform_user.options
  parent: user.admin_index
  weight: 20

smsplatform_user.deriver:
  class: Drupal\Core\Menu\MenuLinkDefault
  deriver: \Drupal\smsplatform_user\Plugin\Derivative\SmsUserMenuLink