docs: def get_metadata():
      """
      Get metadata of symbols, like their tags, id on write-math.com, LaTeX
      command and unicode code point.
  
      Returns
      -------
      dict
      """
      misc_path = pkg_resources.resource_filename('hwrt', 'misc/')
      wm_symbols = os.path.join(misc_path, 'wm_symbols.csv')
      wm_tags = os.path.join(misc_path, 'wm_tags.csv')
      wm_tags2symbols = os.path.join(misc_path, 'wm_tags2symbols.csv')
      return {'symbols': read_csv(wm_symbols),
              'tags': read_csv(wm_tags),
              'tags2symbols': read_csv(wm_tags2symbols)}