add new transaction and add splash screen

core/splash_screen/splash_screen.gd

@@ -0,0 +1,8 @@
+extends Control
+
+@export var main_menu_scene: PackedScene
+@export var display_time: float = 3.0
+
+func _ready() -> void:
+	await get_tree().create_timer(display_time).timeout
+	SceneManager.change_scene(SceneConfig.SceneName.MAIN_MENU)