Add PulseIn Test app

simple app to perform a test of pulseIn.
simply expects a LOW->HIGH->LOW pulse train on Pin 3.
Will wait up to 5 seconds for the first LOW pulse Train.
After the LOW->HIGH transition, times the duration of the pulse using pulseIn.
end of timing is when LOW is detected.

App project was also added to test solution, and solution/project files were touched as appropriate by VS 2013 Express for Windows Desktop

@IoTDan