Add a page about the Release Engineering process to the internal
section of the FreeBSD website (www.freebsd.org/internal).

This page documents the administrative aspects of FreeBSD releases,
including the CVS operations required, a list of files that must be
updated for each release, information about the contents of each disc
on the 4 disc set, and so on ..

Comments and additions are welcome.

Reviewed by: phk, bmah, and others.