Add multi_key_dict.py from https://github.com/formiaczek/multi_key_dictIt uses an MIT license, the Copyright notice should be added to this project's documentation.Signed-off-by: Jan Lindemann <jan@janware.com>
Add multi_key_dict.py from https://github.com/formiaczek/multi_key_dict
It uses an MIT license, the Copyright notice should be added to this project's documentation.