Add ISave interface

State/Global/GlobalState.cs

@@ -3,7 +3,7 @@ using SupaLidlGame.Utils;
 
 namespace SupaLidlGame.State.Global;
 
-public partial class GlobalState : Node
+public partial class GlobalState : Node, ISave
 {
     [Export]
     public Progression Progression { get; set; }

Utils/ISave.cs

@@ -0,0 +1,12 @@
+using Godot;
+
+namespace SupaLidlGame.Utils;
+
+public interface ISave
+{
+    public State.Global.Progression Progression { get; set; }
+
+    public State.Global.MapState MapState { get; set; }
+
+    public State.Global.Stats Stats { get; set; }
+}

Utils/Save.cs

@@ -2,7 +2,7 @@ using Godot;
 
 namespace SupaLidlGame.Utils;
 
-public partial class Save : Resource
+public partial class Save : Resource, ISave
 {
     [Export]
     public State.Global.Progression Progression { get; set; }