Add initial resource and presenter classes for game entities and effects

Code/Autoloads/PresenterRegistry.cs

@@ -0,0 +1,25 @@
+using System.Collections.Generic;
+using GameCore.ECS;
+using Godot;
+
+namespace CryptonymThunder.Code.Autoloads;
+
+public partial class PresenterRegistry : Node
+{
+    private readonly Dictionary<ulong, Entity> _instanceIdToEntity = new();
+
+    public void RegisterPresenter(Node presenterNode, Entity entity)
+    {
+        _instanceIdToEntity[presenterNode.GetInstanceId()] = entity;
+    }
+    
+    public void UnregisterPresenter(Node presenterNode)
+    {
+        _instanceIdToEntity.Remove(presenterNode.GetInstanceId());
+    }
+
+    public bool TryGetEntity(ulong instanceId, out Entity entity)
+    {
+        return _instanceIdToEntity.TryGetValue(instanceId, out entity);
+    }
+}