Establish a way to get the CM3 to communicate with the Arduino digital servo controller

[jakechung42]

We got the IO board and the CM3, but the documentation for using it with the Arduino servo controller is very limited. Waveshare suggests that we will have to look at the schematics to figure out the connection of the GPIO to the shield header pins and program it from there. If we're going ahead with this, we will have to rewrite or come up with our own library for running the Arduino shield. We need to explore our options on this.