Added shared projects

LiteCharms.Features/Products/Queries/GetProductPriceQuery.cs

@@ -0,0 +1,18 @@
+using LiteCharms.Models;
+
+namespace LiteCharms.Features.Products.Queries;
+
+public class GetProductPriceQuery : IRequest<Result<ProductPrice>>
+{
+    public Guid ProductId { get; set; }
+
+    private GetProductPriceQuery(Guid productId) => ProductId = productId;
+
+    public static GetProductPriceQuery Create(Guid productId)
+    {
+        if (productId == Guid.Empty)
+            throw new ArgumentException("ProductId is required.", nameof(productId));
+
+        return new(productId);
+    }
+}