code: def add_files(self, filelist, **kwargs):
          
  
          # check filelist is list type
          if not isinstance(filelist, list):
              raise TypeError("request the list type.")
  
          for file in filelist:
              self.add_file(file)
docs: Append files to file repository.
          
          ModificationMonitor can append files to repository using this.
          Please put the list of file names to `filelist` argument.
  
          :param filelist: the list of file nmaes