hn-8.x-1.x-dev/modules/hn_frontend/hn_frontend.routing.yml

hn_frontend.admin:
  path: '/admin/config/services/hn/frontend'
  defaults:
    _form: '\Drupal\hn_frontend\Form\SettingsForm'
    _title: 'Headless Ninja Frontend Settings'
  requirements:
    _permission: 'administer hn'