New port for ruby-dbi with odbc support

[Tim Lucas]

There's two port files, rb-dbd-pg and db-dbd-mysql that currently  
just extend rb-dbi with a few configure args. They should probably  
use variants, but I digress. I've created another Portfile, in the  
spirit of these two, so you can install ruby-dbi with odbc support  
via macports, just like you can with mysql or postgres. It's a dead- 
simple Portfile.

How can I get this added to the ports tree?

(feel free to point me to an FAQ... the macports site+docos are  
excruciating, have spent ages looking already)

-- tim