Client functionality ready

A new milestone reached! I've completed the telemetry collection functionality for Windows, with Linux following shortly. It has been a fun experiment to figure out when a user is working with programming tasks vs other activities on their computer. And I believe I've found a good way.

The client also handles authentication against the online service so that it's authorized to send in telemetry data for a user.

Next up:

• Build a simple GUI for the telemetry app, so that users easily can add folders to watch, and authenticate against the online service.