Update scene graph

Ghost.Editor.Core/SceneGraph/SceneGraphNode.cs

@@ -0,0 +1,18 @@
+using CommunityToolkit.Mvvm.ComponentModel;
+using System.Collections.ObjectModel;
+
+namespace Ghost.Editor.Core.SceneGraph;
+
+public abstract partial class SceneGraphNode : ObservableObject
+{
+    [ObservableProperty]
+    public partial string Name
+    {
+        get; set;
+    }
+
+    public ObservableCollection<SceneGraphNode> Children
+    {
+        get;
+    } = new();
+}