docs: def add_key(self, key_id, key):
          """
          ::
          
              POST /:login/keys
          
          :param key_id: label for the new key
          :type key_id: :py:class:`basestring`
          
          :param key: the full SSH RSA public key
          :type key: :py:class:`str`
          
          Uploads a public key to be added to the account's credentials.
          """
          data = {'name': str(key_id), 'key': str(key)}
          j, _ = self.request('POST', '/keys', data=data)
          return j