See
http://orgmode.org/worg/org-contribute.html
for the general guidelines.
contrib is more relaxed: it is not distributed with emacs (the only way
to get it is from orgmode - git, elpa, tarball etc), so it does not
require a formal copyright assignment. It is explicitly stripped out of
the orgmode that is packaged with emacs.
All you need to do is send a request out to the list that it be
included in contrib. Then one of the developers (most probably Eric
Schulte in this case) will review it and if it passes muster, he will
add it to contrib.
There is a description of contrib at
http://orgmode.org/worg/org-contrib/
but I'm not sure how current it is.
--
Nick
