added empty file for tracking the classes/ folder
added empty file for tracking the classes/ folder

laurentpetit/ccw,ccw-ide/ccw,noncom/ccw,michelangelo13/ccw,ccw-ide/ccw,ccw-ide/ccw,michelangelo13/ccw,michelangelo13/ccw,noncom/ccw,laurentpetit/ccw,laurentpetit/ccw,noncom/ccw