[vcf-midatlantic] Add-on card edge fingers for mock S-100 boards

[Jonathan Chapman]

> https://www.retrobrewcomputers.org/doku.php?id=boardinventory

Their boards are high-quality modern production with proper hard gold edge plating, I've ordered several for myself, and built up a number for other hobbyists. We use the same board house as they do for boards with hard gold plating.

Thanks,
Jonathan