Get an instance to read information from Microsoft planner

def planner(self, *, resource=''):
        """ Get an instance to read information from Microsoft planner """

        if not isinstance(self.protocol, MSGraphProtocol):
            # TODO: Custom protocol accessing OneDrive/Sharepoint Api fails here
            raise RuntimeError(
                'planner api only works on Microsoft Graph API')

        return Planner(parent=self, main_resource=resource)