Hey there,

Turning your WordPress site into a desktop app is not too difficult. There is even an easier way to do this but I think you should go through this tutorial and learn how Electron works then you can add native app features.

You could even create a single page app that utilizes the WordPress Rest API. Check this: https://webdevstudios.com/2016/05/10/easily-turn-wordpress-site-desktop-app/