Update readme.md

Author: acoumb

src/Umbraco.Cms.Integrations.Commerce.Shopify/readme.md

@@ -1,6 +1,6 @@
 # Umbraco.Cms.Integrations.Commerce.Shopify
 
-This integration provides a products picker and a value converter that uses a strongly typed model for rendering, 
+This integration provides a products picker and a value converter that uses a [strongly typed model](Models/ViewModels/ProductViewModel.cs) for rendering, 
 for products within a simple [Shopify](https://www.shopify.com/) store or through custom apps developed by [Shopify Partners](https://www.shopify.com/partners).
 
 ## Prerequisites
@@ -62,7 +62,7 @@ _Revoke_ action will remove the access token from the database and the authoriza
 
 ### Front-end rendering
 
-A strongly typed model will be generated by the property value converter, and an HTML helper is available, to easily render the products on the front-end.
+A [strongly typed model](Models/ViewModels/ProductViewModel.cs) will be generated by the property value converter, and an HTML helper is available, to easily render the products on the front-end.
 
 Ensure your template has a reference to the following using statement: