[racket] learn racket in 10 minutes

Thanks everybody for the suggestions

I've followed most of them, except adding a section about "Units" because I
felt there was already a lot to take in

Amended version is here:
https://github.com/voila/learnxinyminutes-docs/blob/master/racket.html.markdown

I plan to send a pull request tonight... unless someone find some glaring
mistakes

Thanks again

R
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