Addition of virtual keyboard

Ok so while it's not technically a mobile game, it can be played on mobile!  I had already added gamepad support, so if you have a backbone controller you can play the WebGL game (other controller may work but I haven't got any to test them).  However you couldn't input your name as there was no virtual keyboard.  I've now sorted that!

I used this free one: Simple Virtual Keyboard for Unity WebGL on mobile phones – Ciihuy Creative Shop

It is set up for legacy text fields, but a couple of tweaks in the scripts and it works just fine with TextMeshPro.  :)