Added CartService and LocalStorageService (browser)

LiteCharms.Features.MidrandBooks/Orders/Models/Cart.cs

@@ -0,0 +1,18 @@
+namespace LiteCharms.Features.MidrandBooks.Orders.Models;
+
+public sealed class Cart
+{
+    public long? CustomerId { get; set; }
+
+    public long? OrderId { get; set; }
+
+    public decimal TotalPrice { get; set; }
+
+    public decimal TotalVat { get; set; }
+
+    public decimal VatRate { get; set; } = 0.15m;
+
+    public bool IsVatInclusive { get; set; } = true;
+
+    public IList<CartItem> Items { get; set; } = [];
+}

LiteCharms.Features.MidrandBooks/Orders/Models/CartItem.cs

@@ -0,0 +1,12 @@
+using LiteCharms.Features.MidrandBooks.Products.Models;
+
+namespace LiteCharms.Features.MidrandBooks.Orders.Models;
+
+public sealed class CartItem
+{
+    public ProductPrice? Price { get; set; }
+
+    public long Quantity { get; set; }
+
+    public decimal Amount { get; set; }
+}