Added endpoint to get products under their limit

PyroFetes/Specifications/Products/GetProductsUnderLimitSpec.cs

@@ -0,0 +1,14 @@
+using Ardalis.Specification;
+using PyroFetes.Models;
+
+namespace PyroFetes.Specifications.Products;
+
+public sealed class GetProductsUnderLimitSpec : Specification<Product>
+{
+    public GetProductsUnderLimitSpec()
+    {
+        Query
+            .Include(p => p.QuotationProducts)
+            .Where(p => p.QuotationProducts.Any(q => q.Quantity < p.MinimalQuantity));
+    }
+}