Add a permissive LICENSE

[alv67]

Please add a LICENSE to your code, this will add the possibility to improve it.
Without a License we can only "read" your code and no one can make his modification... I suppose this is not your idea for this code.

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

Why to add a License :
https://opensource.stackexchange.com/questions/1720/what-can-i-assume-if-a-publicly-published-project-has-no-license

Choose a License : https://choosealicense.com/

P.S. generally I use the MIT license.