Add core game components including ConfigFileHandler, GameManager, SaveSystem, and UIManager

scripts/Resources/CollectableResource.cs

@@ -0,0 +1,9 @@
+using Godot;
+
+namespace Mr.BrickAdventures.scripts.Resources;
+
+public partial class CollectableResource : Resource
+{
+    [Export] public Variant Amount { get; set; } = 0.0;
+    [Export] public CollectableType Type { get; set; }
+}