please add an open source license

[GarrettJenkinson]

Hello, I read your paper with great interest. Can you please add an open source license like the MIT license to this repo so others can use the code to reproduce your results?

https://docs.github.com/en/communities/setting-up-your-project-for-healthy-contributions/adding-a-license-to-a-repository

[fedorov]

For the reference of the developers and users of this repository, please note the below, quoted from https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/licensing-a-repository#choosing-the-right-license:

"without a license, the default copyright laws apply, meaning that you retain all rights to your source code and no one may reproduce, distribute, or create derivative works from your work."