code: def add_rows(self, values=None, index=None):
          
          params = {}
          if values is not None:
              if values and not isinstance(values[0], list):
                  # this is a single row
                  values = [values]
              params['values'] = values
          if index is not None:
              params['index'] = index
  
          params = params if params else None
  
          url = self.build_url(self._endpoints.get('add_rows'))
          response = self.session.post(url, data=params)
          if not response:
              return None
          return self.row_constructor(parent=self, **{self._cloud_data_key: response.json()})
docs: Add rows to this table.
          Multiple rows can be added at once.
  
          This request might occasionally receive a 504 HTTP error.
           The appropriate response to this error is to repeat the request.
          :param list values: Optional. a 1 or 2 dimensional array of values to add
          :param int index: Optional. Specifies the relative position of the new row.
           If null, the addition happens at the end.
          :return: