def add_attachment(summary, file, **kwargs)
      @client.add_attachment(summary, file, id, **kwargs).first
    end
def add_attachment(summary, file, **kwargs)
      @client.add_attachment(summary, file, id, **kwargs).first
    end
Add an attachment to the bug
 For the params description, see the Client.add_attachment method.

 @return [ID] of the new attachment