add header

Link: https://code.alibaba-inc.com/Ali-MaaS/MaaS-lib/codereview/10305074

    * add header

modelscope/pipelines/cv/image_style_transfer_pipeline.py

@@ -1,3 +1,5 @@
+# Copyright (c) Alibaba, Inc. and its affiliates.
+
 import os.path as osp
 from typing import Any, Dict