This is the complete sample for the Observable Models with Realm Xamarin blog post. It demonstrates how Realm can help you leverage MVVM without the need for data-only view models.
The app itself is a very simplistic contacts application that allows you to create, edit, and favorite contacts.
If you have any questions or problems with running the sample, don't hesitate to open an issue.
Check the official website for more info on Realm or open an issue if you have problems getting started.