code: def setup_config(form_class, config_model=None):
      
      # allow use as a decorator
      if config_model is None:
          return setup_config(form_class, form_class.model)
  
      app_registry.register('config', AppDataContainer.from_form(form_class), config_model)
docs: Register the provided form as config form for the provided config model
  
      This can be used as a decorator by adding a `model` attribute to the config form::
  
          @setup_config
          class ExampleConfigForm(AppDataForm):
              model = ExampleConfig
  
      :param form_class: Form class derived from AppDataForm
      :param config_model: Model class derived from AppHookConfig
      :return: