add notification when product added to cart on product page

public/js/product.js

@@ -6,10 +6,11 @@ function setAddToCardEventListener() {
             .then(function (response) {
                 const cartAmountElem = document.querySelector('.amount-in-cart');
                 cartAmountElem.textContent = response.data;
+                toastr.success('Product added to cart');
             })
             .catch(function (error) {
                 console.log(error);
-                alert('Sorry, error, we are just learning how to code');
+                toastr.error('Error, something went wrong');
             });
     });
 }