docs: def user(context, name, email):
      """Add a new or display information about an existing user."""
      existing_user = context.obj['store'].user(email)
      if existing_user:
          click.echo(existing_user.to_dict())
      elif name:
          new_user = context.obj['store'].add_user(name, email)
          click.echo(click.style(f"New user added: {email} ({new_user.id})", fg='green'))
      else:
          click.echo(click.style('User not found', fg='yellow'))