code: def add_cli_summarize(main: click.Group) -> click.Group:  # noqa: D202
      
  
      @main.command()
      @click.pass_obj
      def summarize(manager: AbstractManager):
          """Summarize the contents of the database."""
          if not manager.is_populated():
              click.secho(f'{manager.module_name} has not been populated', fg='red')
              sys.exit(1)
  
          for name, count in sorted(manager.summarize().items()):
              click.echo(f'{name.capitalize()}: {count}')
  
      return main
docs: Add a ``summarize`` command to main :mod:`click` function.