[REUSE] Introduce folder.license file

[Matija Šuklje]

Die 13. 03. 20 et hora 09:20 nicolas1.toussaint at orange.com scripsit:
> +1 to slowly deprecate dep5, for all reasons given before
> +1 to store folder specific licensing info *inside* the folders (I guess
> we all agree in fact)

I agree.

One option would be to call that file simply `.license` analogous to the 
`.desktop` file that we all know and love. Obviously this would be a hidden file 
on *nix systems, which has its pluses and minuses.

e.g.:

.
├── .license
├── ant_gatherer.blend
├── castle.blend
├── envmaps
│   └── radiomap.jpg


Another option would be to actually just call it literally `folder.license`

.
├── folder.license
├── ant_gatherer.blend
├── castle.blend
├── envmaps
│   └── radiomap.jpg


cheers,
Matija
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