public async Task <IActionResult> AddReview([HttpTrigger(AuthorizationLevel.Anonymous, "post", Route = "reviews/{productId}")] HttpRequest request, string productId)
        {
            var reviewModel = await request.DeserializeBody <ReviewRequestModel>();

            var review = new Review(reviewModel.NumberOfStarts, reviewModel.Description);

            repository.AddProductReview(productId, review);

            return(ActionResults.Created());
        }