code: def add_folder(self, path, title, description=None, language=None, thumbnail=None, source_id=None, **node_data):
          
          self._parse_path(path)
          path = path if path.endswith(title) else "{}/{}".format(path, title)
          self._commit(path, title, description=description, language=language, thumbnail=thumbnail, source_id=source_id)
docs: add_folder: Creates folder in csv
              Args:
                  path: (str) where in zip to write folder
                  title: (str) content's title
                  source_id: (str) content's original id (optional)
                  description: (str) description of content (optional)
                  language (str): language of content (optional)
                  thumbnail (str):  path to thumbnail in zip (optional)
              Returns: None