You're under no obligation to choose a license. 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.
But I can see that you have guidelines for contributing which suggests that you're ok with people creating derivative works. Could you clarify?
Thanks for the great work, it is very handy!
I'm just a bit curious if there has been a licence chosen for this project? [According to Github]:(https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/licensing-a-repository)
But I can see that you have guidelines for contributing which suggests that you're ok with people creating derivative works. Could you clarify?