def add_target(self, asset_target):
        if not isinstance(asset_target, AssetTarget):
            raise InvalidTargetError("Not an asset target!")
        self.targets.append(asset_target)
Add a ColorTarget <color_target> which specifies the
dataset/ETHPy150Open chromaway/ngcccbase/ngcccbase/txcons.py/BasicTxSpec.add_target