Video license

[Björn Höfling]

Hello,

while looking at the videos and the video-repository, I noticed that we
don't have any license attached to neither the videos nor the sources.

I think we should really add one. For the code I would suggest GPL v3+,
for the voices (currently Paul) and videos I would suggest CC-BY-SA 4.0
[0].

What do you think? Does every contributor agree to that?

Björn

[0] https://creativecommons.org/licenses/by-sa/4.0/

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