Update readme

README.md

@@ -80,7 +80,9 @@ make integration-test
 
 #### Changing the routes and templates
 
-*COMING SOON*
+Hastl allows you to combine strongly-typed Servant APIs to make up your application. To add a new route and endpoint, you can create a new file similar to `lib/Api/User.hs` e.g. if you wanted to create a Todo-list API you could create `lib/Api/Todo.hs`. Additionally, you can create a new directory within `lib/Api/Templates` to store your Lucid-powered Haskell template files. Within the template files, you have access to the full power of HTMX and Alpine through helper functions.
+
+If you wish to use persistent models in your application, you can define your models in `lib/Models.hs` and persistent will automatically create the Haskell types, as well as handling the database migrations for DEVELOPMENT setups (note: is it recommended to use a more robust migration mechanism for production).
 
 [Haskell]: https://img.shields.io/badge/haskell-5D4F85?style=for-the-badge&logo=haskell&logoColor=white
 [Haskell-url]: https://haskell.org