def add_root_repository(self, repository_id=None):
pass<EOL>
Adds a root repository.

        :param repository_id: the ``Id`` of a repository
        :type repository_id: ``osid.id.Id``
        :raise: ``AlreadyExists`` -- ``repository_id`` is already in hierarchy
        :raise: ``NotFound`` -- ``repository_id`` not found
        :raise: ``NullArgument`` -- ``repository_id`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

        *compliance: mandatory -- This method must be implemented.*