Run Zephyr on Raspberry Pi Pico W (source code)

= Run Zephyr on <Raspberry Pi Pico W>

The Zephir <LED blinker> example does not work on the <Raspberry Pi Pico W> because the on-board LED is wired differently. But the hello world works and with:
``
screen /dev/ttyUSB0 115200
``
host shows:
``
*** Booting Zephyr OS build v4.2.0-491-g47b07e5a09ef ***
Hello World! rpi_pico/rp2040
``
Nice!