Add a license file

[StegSchreck]

For other developers and also companies to be able to use this nice tool in a compliant way, it would be great, if you could add a license to this repository.

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

Helper to choose the license for your use-case: https://choosealicense.com/

[StegSchreck]

@MrPowers

[MrPowers]

@StegSchreck - Added a LICENSE. Thanks for opening the issue. Let me know if you need anything else!

[StegSchreck]

Thank you!