The MVVM Pattern

The Windows App in the project uses MVVM Design Pattern. In a gist, MVVM simply separates the UI logic from the Data logic or front-end from back-end. Hence, all devs can easily change the code in the backend without making drastic changes to the front-end.

Make sure you get a basic understanding of the pattern before working on the Windows App.

Here you can find more about this pattern:

The MVVM Pattern (MSDN)

Model-view-viewmodel(Wikipedia)