Blackjack kata

This kata is for scoring a set of cards using blackjack rules, and returning both a total score of the cards given, and a status of the game.

The score() method totals the cards given and returns a total score;

cards 2-10 are worth their value Jack, King, Queen are worth 10

1. pass a single card to the score method and return the score

2. pass multiple cards to the score method and return the score

3. also return from result the string 'score', 'blackjack' (for 21), or 'bust' (over 21)

4. include Ace as a possibility, which returns either 1 or 11. Return both scores, and both results as arrays.

5. create a new 'Game' class, which contains a play() method. This method should take two sets of cards, 'playerCards' and 'opponentCards', and return a string of 'you win' or 'you lose';

Update

Kata evolved in different direction, steps as follows:

1. pass a single card to the score method and return the score

2. pass multiple cards to the score method and return the score

3. return a result object which tells you your score, and also if your score is blackjack or bust

Next feature was to be:

4. include Ace in the card ranks, treating it as 11 until the score would be bust, and then treating it as 1.