custom_add_content-8.x-1.2/custom_add_content.routing.yml

custom_add_content.config:
  path: 'admin/config/user-interface/custom_node_add'
  defaults:
    _form: 'Drupal\custom_add_content\Form\AddContentConfigurationForm'
    _title: 'Custom Add Content'
  requirements:
    _permission: 'administer site configuration'