code: def add_vq(self, parser):
          ''' Add verbose & quiet options '''
          group = parser.add_mutually_exclusive_group()
          group.add_argument("-v", "--verbose", action="store_true")
          group.add_argument("-q", "--quiet", action="store_true"f add_vq(self, parser):
          ''' Add verbose & quiet options '''
          group = parser.add_mutually_exclusive_group()
          group.add_argument("-v", "--verbose", action="store_true")
          group.add_argument("-q", "--quiet", action="store_true")
docs: Add verbose & quiet options