create a new :class:`WikiPage`

        :param project: :class:`Project` id
        :param slug: slug of the wiki page
        :param content: content of the wiki page
        :param attrs: optional attributes for the :class:`WikiPage`

def create(self, project, slug, content, **attrs):
        """
        create a new :class:`WikiPage`

        :param project: :class:`Project` id
        :param slug: slug of the wiki page
        :param content: content of the wiki page
        :param attrs: optional attributes for the :class:`WikiPage`
        """
        attrs.update({'project': project, 'slug': slug, 'content': content})
        return self._new_resource(payload=attrs)