docs: def add_file_to_repo(filename):
      """Add a file to the git repo
  
      This method does the same than a ::
  
          $ git add filename
  
      Keyword Arguments:
          :filename: (str) -- name of the file to commit
  
      Returns:
          <nothing>
      """
      try:
          repo = Repo()
          index = repo.index
          index.add([_delta_dir() + filename])
      except Exception as e:
          print("exception while gitadding file: %s" % e.message)