Add a video rotate example

[sebma]

Hi, can you please add a video rotate example ? :

rotate-video.sh

[kfrn]

Hi there! I haven't used rotate before, looks neat.

How would you feel about adding the recipe yourself, @sebma? (or anyone else reading who wants to go ahead)
I'd like to say that I'll check it out and add the recipe, but I'm pretty full-tilt at the moment.

[sebma]

@kfrn

How would you feel about adding the recipe yourself, @sebma?

Why not but how do I do that ?

[kfrn]

@kfrn

How would you feel about adding the recipe yourself, @sebma?

Why not but how do I do that ?

Instructions are here in the README :)