If you want to add Windows Store Games to Steam to show up on your Status you need to do a bit of a warkaround because Steam cand see UWP apps, this program aims to simplify a little bit the process where it is possible by automating the scripting and launching.
# To add UWP games to Steam #
1. Download UWPHook, it's files and store them somewhere on your PC.
2. Create a shortcut to UWPHook by right clicking it and choosing "Create Shortcut" and name it something simple that resembles the game you want to add to Steam.
6. Find UWPHook at your Library, right click it, change the name from UWPHook to the name of the game you want, change target to the name of the shortcut you created