Add initial asf.yaml configuration #24

Job	Run time
populate-targets	2s
newt dump (bleprph-nrf52840pdk, ubuntu-latest)	16s
newt dump (bleprph-nrf52840pdk, windows-latest)	1m 54s
newt dump (bleprph-nrf52840pdk, macos-latest)	20s
newt dump (boot-nrf52dk, ubuntu-latest)	15s
newt dump (boot-nrf52dk, windows-latest)	1m 34s
newt dump (boot-nrf52dk, macos-latest)	21s
newt dump (btshell-nrf52840pdk, ubuntu-latest)	22s
newt dump (btshell-nrf52840pdk, windows-latest)	2m 26s
newt dump (btshell-nrf52840pdk, macos-latest)	19s
newt dump (btshell-nrf52dk, ubuntu-latest)	17s
newt dump (btshell-nrf52dk, windows-latest)	1m 16s
newt dump (btshell-nrf52dk, macos-latest)	19s
newt dump (my_blinky_sim, ubuntu-latest)	14s
newt dump (my_blinky_sim, windows-latest)	1m 54s
newt dump (my_blinky_sim, macos-latest)	23s
	12m 12s

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