Add item spawn menu

Fix game over bug
Start adding more implementation for jewels

Zennysoft.Game.Ma.Implementation/Item/IInventory.cs

@@ -14,6 +14,8 @@ public interface IInventory
 
   public bool Sort(EquipableItem currentWeapon, EquipableItem currentArmor, EquipableItem currentAccessory, EquipableItem ammo);
 
+  public bool AtCapacity();
+
   public event Action<string> BroadcastMessage;
   public event Action InventoryChanged;
 }