added custom pio task "Create UF2 file"

platformio.ini

@@ -76,6 +76,7 @@ platform = https://github.com/pioarduino/platform-espressif32/releases/download/
 [nrf52_base]
 extends = arduino_base
 platform = nordicnrf52
+extra_scripts = create-uf2.py
 build_flags = ${arduino_base.build_flags}
   -D NRF52_PLATFORM
   -D LFS_NO_ASSERT=1