code: def create_connected_service(self, connected_service_creation_data, project_id):
          
          route_values = {}
          if project_id is not None:
              route_values['projectId'] = self._serialize.url('project_id', project_id, 'str')
          content = self._serialize.body(connected_service_creation_data, 'WebApiConnectedServiceDetails')
          response = self._send(http_method='POST',
                                location_id='b4f70219-e18b-42c5-abe3-98b07d35525e',
                                version='5.0-preview.1',
                                route_values=route_values,
                                content=content)
          return self._deserialize('WebApiConnectedService', response)
docs: CreateConnectedService.
          [Preview API]
          :param :class:`<WebApiConnectedServiceDetails> <azure.devops.v5_0.core.models.WebApiConnectedServiceDetails>` connected_service_creation_data:
          :param str project_id:
          :rtype: :class:`<WebApiConnectedService> <azure.devops.v5_0.core.models.WebApiConnectedService>`