'Create an endpoint to project association.
:param endpoint_id: identity of endpoint to associate
:type endpoint_id: string
:param project_id: identity of the project to be associated with
:type project_id: string
:raises: keystone.exception.Conflict: If the endpoint was already
added to project.
:returns: None.'

@abc.abstractmethod
def add_endpoint_to_project(self, endpoint_id, project_id):

    raise exception.NotImplemented()
