Add step for cloning this repo to README.
Add step for cloning this repo to README.

TigerBSD/TigerBSD,TigerBSD/TigerBSD,TigerBSD/TigerBSD,TigerBSD/TigerBSD,TigerBSD/TigerBSD,TigerBSD/TigerBSD,TigerBSD/TigerBSD,TigerBSD/TigerBSD,eriknstr/ThinkPad-FreeBSD-setup,TigerBSD/TigerBSD,TigerBSD/TigerBSD,TigerBSD/TigerBSD,TigerBSD/TigerBSD