Initial Commit

Included all necessary PCB files with this commit. If you dont intend to
modify the PCB, use the zip file.

Add the con-3.5mm-stereo-smt.lbr to eagle before proceeding to modify
the schematics and board.

Available on OSHPark (https://oshpark.com/shared_projects/3Ss2o3g2) for
3.85 USD for a set of three