feat(*): Add hud with timer

Game/scripts/game.gd

@@ -0,0 +1,23 @@
+extends Node3D
+
+@onready var game_timer: Timer = get_node("Timer")
+signal timer_updated(minutes: int, seconds: int)
+
+func _ready():
+	# Set timer to 2 minutes 30 seconds (150 seconds)
+	game_timer.wait_time = 150.0
+	game_timer.one_shot = true  # Timer runs once
+	game_timer.start()
+	
+func _process(_delta):
+	if game_timer.time_left > 0:
+		var time_left = game_timer.time_left
+		var minutes = int(time_left) / 60
+		var seconds = int(time_left) % 60
+		timer_updated.emit(minutes, seconds)
+	else:
+		print("Timer finished!")
+
+func _on_timer_timeout() -> void:
+	if game_timer.time_left == 0:
+		get_tree().change_scene_to_file("res://scenes/main_menu.tscn")