Create game struct

[dnsbty]

We'll want a struct for managing the state of the game. This will depend on #1 and #3. I'm seeing this looking something like the following:

• current_round
• players: list of players
• draw pile: list of cards in the draw pile
• discard pile: list of cards in the discard pile
• hands: map with a list of the cards in each player's hand keyed by player name
• scoring: map of score objects (containing level and score) keyed by player name
• table: map of tabled cards keyed by player name to represent what's been laid out

Table Example

%{
  "Dennis" => [
    {:set, [%Card{}, %Card{}, %Card{}]},
    {:run, [%Card{}, %Card{}, %Card{}]}
  ]
}