[Midnightbsd-cvs] src: contrib/xz: Add import instructions and files.

[laffer1 at midnightbsd.org]

Log Message:
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Add import instructions and files.

Added Files:
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    src/contrib/xz:
        MIDNIGHTBSD-Xlist (r1.1)
        (http://cvsweb.midnightbsd.org/src/contrib/xz/MIDNIGHTBSD-Xlist?rev=1.1&content-type=text/x-cvsweb-markup)
        MIDNIGHTBSD-upgrade (r1.1)
        (http://cvsweb.midnightbsd.org/src/contrib/xz/MIDNIGHTBSD-upgrade?rev=1.1&content-type=text/x-cvsweb-markup)