In this case it will be a hack (since you want to add to the template); however the "base" funcitonality you're looking for is already there.

Quoting myself from here:
Originally Posted by Gizmo
There are 5 "custom" fields; you'd generally just use those (by naming them); see:
CP -> Membership -> Registration Settings -> Registration Screen (tab)

They're at the bottom of the page.

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