update null modem driver readme file
update null modem driver readme file

akuhtz/serial-communication-manager,RishiGupta12/serial-communication-manager,akuhtz/serial-communication-manager,akuhtz/serial-communication-manager,RishiGupta12/SerialPundit,RishiGupta12/SerialPundit,RishiGupta12/SerialPundit,akuhtz/serial-communication-manager,RishiGupta12/SerialPundit,RishiGupta12/serial-communication-manager,RishiGupta12/serial-communication-manager