Request to add a license

[njfox]

Thanks a lot for putting this tool together, it's really helpful! I'd like to suggest adding a license so that users may make modifications to the code. I have some tweaks I'd like to make for private use but I'm currently not legally allowed to since the default copyright rules apply:

However, 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. If you're creating an open source project, we strongly encourage you to include an open source license.