start games with player ids

Fixes #1.

game/game.go

@@ -24,9 +24,13 @@ type Game struct {
 }
 
 // New creates a new game started at round 1.
-func New() *Game {
+func New(dealer, challenger player.ID) *Game {
 	g := &Game{
 		RNG: NewRNG(),
+		PP: [2]Player{
+			{ID: dealer},
+			{ID: challenger},
+		},
 	}
 	g.StartRound()
 	return g