Added Pi PIcoW support in the following modes:

- Companion Radio over USB Serial
- Repeater
- Room Server
- Terminal Chat

platformio.ini

@@ -47,6 +47,7 @@ lib_deps =
   file://arch/esp32/AsyncElegantOTA
 
 ; ----------------- NRF52 ---------------------
+
 [nrf52_base]
 extends = arduino_base
 platform = nordicnrf52
@@ -60,3 +61,10 @@ lib_deps =
   ${nrf52_base.lib_deps}
   rweather/Crypto @ ^0.4.0
   https://github.com/adafruit/Adafruit_nRF52_Arduino
+
+; ----------------- RP2040 ---------------------
+
+[rp2040_base]
+extends = arduino_base
+build_flags = ${arduino_base.build_flags}
+  -D RP2040_PLATFORM