nRF52840 based carrier board. Requested per [forum](https://community.platformio.org/t/dev-support-for-arduino-edge-control/28646). * https://www.arduino.cc/pro/hardware/product/edge-control * https://docs.arduino.cc/hardware/edge-control * https://github.com/arduino/ArduinoCore-mbed/tree/master/variants/EDGE_CONTROL
