Badger2040w RTC example

[North101]

Might be useful to the document the badger2040w RTC and link to the example https://github.com/pimoroni/pimoroni-pico/blob/main/micropython/examples/pcf85063a/pico_rtc.py

Would it be worth having the micropython machine.RTC call the pcf85063a functions? https://docs.micropython.org/en/latest/library/machine.RTC.html