gEDA-user: [pcb] "first board" docs

[DJ Delorie]

> I would probably add a pot to this one (or a header for a pot).

The trimmers all have different footprints; I figured pretty much
everyone has a generic resistor and LED.

> For board > 1 you could probably get some ideas from the
> beginners kits that are sold in places like You-Do-It Electronics
> or RadioShack.

Actually, I have one of those on the chair next to me, with the 555
circuit on it.