Adds initial reader code.
Adds initial reader code.

hamishwillee/dronekit-python,trishhyles/dronekit-python,diydrones/dronekit-python,hamishwillee/dronekit-python,diydrones/dronekit-python,dronekit/dronekit-python,dronekit/dronekit-python,duststorm/dronekit-python,duststorm/dronekit-python,trishhyles/dronekit-python