[to #42322933]add license header

Link: https://code.alibaba-inc.com/Ali-MaaS/MaaS-lib/codereview/10353812

    * add license header

modelscope/models/cv/image_color_enhance/csrnet.py

@@ -1,3 +1,6 @@
+# The implementation is adopted from Jingwen He,
+# made publicly available at https://github.com/hejingwenhejingwen/CSRNet
+
 import functools
 import math
 

modelscope/models/cv/image_color_enhance/image_color_enhance.py

@@ -1,3 +1,4 @@
+# Copyright (c) Alibaba, Inc. and its affiliates.
 import os.path as osp
 from copy import deepcopy
 from typing import Dict, Union