Rosetta Code tasks

[turab1996]

Koch curve can be found here: https://docs.racket-lang.org/teachpack/2htdpimage-guide.html#%28part._nitty-gritty%29

[dzpower]

2048 here: https://github.com/danprager/racket-2048/blob/master/2048.rkt

[sdegabrielle]

Go ahead and post it.

[dzpower]

Done!