Add 'hit' subcommand

[Vlek]

In order to start a game of blackjack, we need to be able to say hit.

This should do different things based on whether we have already initialized a game:

• Game not started:
  • Initializes a game, and:
  • If the player has 21:
    • States Blackjack and plays dealer's turn
  • Else:
    • Gives 'hit or stay?' message
• Game started:
  • The player will be given an additional card:
  • If they are < 21:
    • Gives the 'hit or stay?' message
  • If at 21:
    • Plays the dealer's turn, ends the game
  • If over 22:
    • Gives the 'You lose' message

All should display the current state of the game first beforehand: Player: : Dealer: ?: ?

[Vlek]

Should we also add 'draw' as an alias?

[Vlek]

Done. :)