Brief section about poudriere in README.
Brief section about poudriere in README.

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