[to #42322933] add license

Link: https://code.alibaba-inc.com/Ali-MaaS/MaaS-lib/codereview/10202082

modelscope/pipelines/cv/action_detection_pipeline.py

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