[PVE-User] Add troubleshooting page to the wiki

[Aaron C. de Bruyn]

I created a page for issues involving the guest keyboard in Windows
(the i8042 port driver problem)

http://pve.proxmox.com/wiki/Guest_Keyboard_Problems

I'm not sure who approves the pages and adds them into the
troubleshooting section, but there it is.

Thanks,

-A