A little of coordination for Rosettacode

[bearophile]

I have added a D entry for the "Go Fish" game:

http://rosettacode.org/wiki/Go_Fish#D

I don't know the Go Fish game, so I am not sure this code is 
correct. Is some of you able and willing to test its play a bit?

(This D entry is very Python-style because it's a translation of 
the Python entry, so it's not very strongly typed. Generally in D 
I prefer stronger typing, but in this case I think it's 
acceptable).

Bye,
bearophile