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());
}