Added VR Build of Demo

I've added an update to this demo which includes VR support. I wanted this game to be in VR to begin with but due to me using it as a college assignment I had to target the browser. The implementation in VR is fairly basic for now, I want to expand out the interactions to not be so basic. Currently your gun is attached to your hand at all times but I want to experiment with the ability to implement an inventory system that lets you steal weapons from enemies and switch between them. 
I have other ideas for what I want to do with this demo that I am going to work on in my spare time and I hope to be able to post updates here at some point.