Add the Announcement file for FreeBSD 1.1.5.1
Add the What's New file for FreeBSD 1.1.5 & 1.1.5.1

1.1.5.1 Announcement via
https://ftp.netbsd.org/pub/NetBSD/misc/release/FreeBSD/FreeBSD-1.1.5.1

What's New files via
http://ftp.internat.freebsd.org/pub/FreeBSD/old/1.1-to-1.1.5.1/

PR: 212521
Submitted by: Sevan Janiyan <venture37 AT geeklan co uk>
Approved by: bcr (mentor)
Obtained from: NetBSD
Differential Revision: https://reviews.freebsd.org/D9097