def do_add_auth(self, params):
        """
\x1b[1mNAME\x1b[0m
        add_auth - Authenticates the session

\x1b[1mSYNOPSIS\x1b[0m
        add_auth <scheme> <credential>

\x1b[1mEXAMPLES\x1b[0m
        > add_auth digest super:s3cr3t

        """
        self._zk.add_auth(params.scheme, params.credential)