add: Template for Save and config

src/Scenes/RootScene.cs

@@ -1,19 +1,21 @@
 using Godot;
-
 namespace Polonium.Scenes;
-
-public abstract partial class RootScene : Node2D
+[GlobalClass]
+public partial class RootScene : Node2D
 {
-    private Polonium.Scenes.Scene CurrentScene { get; set; }
+    private Scene CurrentScene { get; set; }
 
-    public void SwitchScene(Polonium.Scenes.Scene scene)
+    public void SwitchScene(Scene scene)
     {
         if (CurrentScene != null)
             RemoveChild(CurrentScene);
         AddChild(scene);
         CurrentScene = scene;
     }
-    
-    
 
+    public override void _Ready()
+    {
+        PoloniumRegistry.Instance.RootScene = this;
+        base._Ready();
+    }
 }