Added Register-WindowsApps.ps1

This script registers a hard coded list of the WindowsApps
on my system as of the date it was created. I needed it
because after the Win8.1 upgrade, all of the Windows Store
apps on my laptop stopped working. Not sure why. Anyway,
this script re-registered them and that got them working.

TODO: Write a version that iterates over all the apps that
are currently installed instead of hard coding the list.