add module header for test_flip_image.py

tests/test_flip_image.py

+"""
+Identifier:     csst_proto/test_flip_image.py
+Name:           test_flip_image.py
+Description:    图像翻转的单元测试
+Author:         Bo Zhang
+Created:        2023-10-26
+Modified-History:
+    2023-11-25, Bo Zhang, add module header
+"""
 import os
 import unittest