streamlined and improved main README (GitHub landing page)
streamlined and improved main README (GitHub landing page)

idcrook/rpi-iot-demo-2017,idcrook/rpi-iot-demo-2017,idcrook/rpi-iot-demo-2017,idcrook/rpi-iot-demo-2017,idcrook/rpi-iot-demo-2017,idcrook/rpi-iot-demo-2017