def add_content(self, **content):
        """
        Adds given content to the cache.

        Usage::

            >>> cache = Cache()
            >>> cache.add_content(John="Doe", Luke="Skywalker")
            True
            >>> cache
            {'Luke': 'Skywalker', 'John': 'Doe'}

        :param \*\*content: Content to add.
        :type \*\*content: \*\*
        :return: Method success.
        :rtype: bool
        """

        LOGGER.debug("> Adding '{0}' content to the cache.".format(self.__class__.__name__, content))

        self.update(**content)
        return True
Adds given content to the cache.

        Usage::

            >>> cache = Cache()
            >>> cache.add_content(John="Doe", Luke="Skywalker")
            True
            >>> cache
            {'Luke': 'Skywalker', 'John': 'Doe'}

        :param \*\*content: Content to add.
        :type \*\*content: \*\*
        :return: Method success.
        :rtype: bool