[REUSE] REUSE.yaml

[Andreas Cord-Landwehr]

Hi, I really like this idea! It would solve some use cases for me, where I was 
waiting for a better solution than the individual file.license files (e.g. 
folders with many icons, folders with test data). And I think that it is 
important that the file is easy to see, meaning it is not a hidden file. Same 
for the fact that it is easy to read by a human.

The only point I am a little bit undecided about is, if one should really 
allow arbitrary regular expressions in the REUSE.yaml files, especially going 
outside of the scope of the folder the file is stored in. This will make it 
harder to detect issues with contradicting license statements. However, the 
reuse lint tooling could be the answer for this.

Best regards,
Andreas