Add install flow

godot/install_status_button.gd

@@ -0,0 +1,13 @@
+extends Button
+
+@export var game: String
+
+func _ready():
+	if FileAccess.file_exists("user://%s.pck" % game):
+		text = "✅"
+	else:
+		text = "⚠️"
+
+func _pressed():
+	if !FileAccess.file_exists("user://%s.pck" % game):
+		get_tree().change_scene_to_file("res://installer.tscn")