Create README.md

Hi there,

I managed to run your program in DrRacket,
but I don't know what to do then.

I see the globe, I can click on tile to see it's id,
I can rotate globe with mouse, but don't know how to do more with keys I see in the source:
#\q, #\w.

I am new with Racket language, but your application is very interesting and I would like to learn more.

--
Best regards,
Tomasz Kuter
me@tomaszkuter.com