add copyright/author

config.py

@@ -13,6 +13,10 @@ then inserted into the OS environment (in this case, resulting in
 SECTION_FOO=... and SECTION_BAR_BAZ=... ). 
 The OS environment takes precedence - if a key is found in both env and config,
 the config setting will be ignored.
+
+Author(s): anatol.ulrich@basebox.io
+
+Copyright (c) 2023 basebox GmbH. All rights reserved.
 """