STAMP-C3/C3U Arduino Example

1. Use Arduino to open the projects.
2. Install ESP32 in Board Manager and all dependency libraries.
3. Select board type to "ESP32C3 Dev Module".
4. Enter download boot mode by holding STAMP-C3/C3U's center button and then connect it to the computer.
5. You can see serial port now, select the right serial port.
6. Compile, upload and run the example.