Added payment database objects

LiteCharms.Features.MidrandBooks/Products/Models/ProductInventory.cs

@@ -0,0 +1,18 @@
+namespace LiteCharms.Features.MidrandBooks.Products.Models;
+
+public class ProductInventory
+{
+    public long Id { get; set; }
+
+    public DateTime CreatedAt { get; set; }
+
+    public InventoryStatuses Status { get; set; }
+
+    public long ProductId { get; set; }
+
+    public long ProductPriceId { get; set; }
+
+    public int TotalAllocated { get; set; }
+
+    public int TotalReserved { get; set; }
+}