Add the full working Arduino code for cart loading.
Handle the UI elements, connection to the Arduino
and loading the cartridge over serial.
This code should not be shared with students as it
is the full working code for the communication.
The project setup contains README, LICENSE, the full UI and materials.
The PICO-8 side is wired up, but all the Arduino code is absent as
I need to figure out how to carve it out for the students.
