Fix link to porting guide in README.md
Fix link to porting guide in README.md

Signed-off-by: Carlos Cardenas <504782fc3554af90fb53d2c844fccc4b0d6e8469@gmail.com>

ms-iot/iot-utilities,ms-iot/iot-utilities,ms-iot/iot-utilities,ms-iot/iot-utilities