Added Inventory System

Inventory/CSharp/InventoryController.cs

@@ -0,0 +1,18 @@
+using Godot;
+
+public partial class InventoryController : Control
+{
+    [Export] public Inventory Inventory;
+
+    public override void _Ready()
+    {
+        var inventorySlots = GetTree().GetNodesInGroup("inventory_slots_cs");
+
+        for (int i = 0; i < inventorySlots.Count; i++)
+        {
+            var slot = (InventorySlot)inventorySlots[i];
+
+            slot.InitializeSlot(i, Inventory);
+        }
+    }
+}