Attach a file to the :class:`Task`

        :param attached_file: file path to attach
        :param attrs: optional attributes for the attached file

def attach(self, attached_file, **attrs):
        """
        Attach a file to the :class:`Task`

        :param attached_file: file path to attach
        :param attrs: optional attributes for the attached file
        """
        return TaskAttachments(self.requester).create(
            self.project, self.id,
            attached_file, **attrs
        )