feat: select game duration

app/src/main/java/game/Game.java

@@ -15,13 +15,12 @@ public class Game {
 		GameNotStarted, GameGoing, GameEnd
 	}
 
-	public static final int GAME_DURATION = 10 * 60;
-
 	private final Map<Integer, Player> players;
 	private final List<Player> leaderboard;
 	private GameState gameState;
 	private MultiDoku doku;
 	private Instant startTime = null;
+	private long gameDuration;
 
 	public Game() {
 		this.players = new HashMap<>();
@@ -53,10 +52,15 @@ public class Game {
 		return players;
 	}
 
-	public void startGame(MultiDoku doku, Instant startTime) {
+	public void startGame(MultiDoku doku, Instant startTime, long gameDuration) {
 		this.doku = doku;
 		this.gameState = GameState.GameGoing;
 		this.startTime = startTime;
+		this.gameDuration = gameDuration;
+	}
+
+	public void stopGame() {
+		this.gameState = GameState.GameEnd;
 	}
 
 	public GameState getGameState() {
@@ -75,4 +79,8 @@ public class Game {
 		return startTime;
 	}
 
+	public long getGameDuration() {
+		return gameDuration;
+	}
+
 }