Adding a license

[tanguy7]

Dear kevalvc,

I hope this message finds you well. I recently came across your Python application, it's a great app bravo! I was wondering if you might consider adding a license to the repository. This addition would allow individuals to use it and modify it for data labeling purposes and properly cite the repository in their academic papers. Your kind consideration of this request would be greatly appreciated. Thank you very much for your time.

Best,
Tanguy