dk Directory Reference

Files
	board-buttons.c
	nRF52840 DK specific buttons driver implementation.
	board-leds.c
	nRF52840 DK specific LED driver implementation.
	board-sensors.c
	nRF52840 DK specific sensors driver implementation.
	nrf52840-dk-conf.h
	nRF52840 DK specific configuration.
	nrf52840-dk-def.h
	nRF52840 DK specific configuration.