- First drop of the Cards package.

This is largely what we discussed as being the Cards package. Some differences is that in place of "knowing" you now "peek" (this is normal naming convention with these type of structures).

You can now retrieve cards from a Hand either by its identifier or by its array index. If retrieving by identifier, then the first card in the hand to fulfill that identifier will be returned.    

@TODO Initial card population of the Deck class.