Add two basic CQRS commands/queries

src/Printbase.Application/Products/Dtos/ProductVariantDto.cs

@@ -0,0 +1,14 @@
+namespace Printbase.Application.Products.Dtos;
+
+public class ProductVariantDto
+{
+    public Guid Id { get; set; }
+    public string? Color { get; set; }
+    public string? Size { get; set; }
+    public decimal Price { get; set; }
+    public decimal? Discount { get; set; }
+    public decimal DiscountedPrice => Discount is > 0 ? Price - Price * Discount.Value / 100m : Price;
+    public int Stock { get; set; }
+    public string? SKU { get; set; }
+    public bool IsActive { get; set; }
+}