hardware: Add schematic

hardware: libs: Add FT2232D USB to Serial convert module This module is provided from AKIZUKI DENSHI TSUSHO CO.,LTD. Look the below to get more information about it. * http://akizukidenshi.com/catalog/g/gM-02990/

Backlink to CADLAB.io has been added.

Add gitignore for kicad

Add directory for datasheet All files in this directory w/o dat files are ignored by git.

Initial commit