Implement inventory system with item management and pickup functionality

GameCore/Inventory/InventorySystem.cs

@@ -0,0 +1,26 @@
+using GameCore.ECS;
+using GameCore.ECS.Interfaces;
+using GameCore.Events;
+
+namespace GameCore.Inventory;
+
+public class InventorySystem : ISystem
+{
+    private readonly World _world;
+
+    public InventorySystem(World world)
+    {
+        _world = world;
+        _world.Subscribe<AddItemToInventoryEvent>(OnAddItem);
+    }
+
+    public void Update(World world, float deltaTime)
+    {
+    }
+
+    private void OnAddItem(AddItemToInventoryEvent e)
+    {
+        var inventory = _world.GetComponent<InventoryComponent>(e.Target);
+        inventory?.AddItem(e.Item);
+    }
+}