Seeed XIAO BLE Sense (nRF52840) + Expansion board

Seeed XIAO BLE Sense (nRF52840) + XIAO Expansion board

ref:
~ Getting Started with XIAO BLE (Sense)
~ Seeeduino XIAO Expansion board

Related:
~ Setup Arduino IDE to support Seeed XIAO BLE (Sense), fix 'exec: "adafruit-nrfutil": executable file not found in $PATH'
~ control the on-Expansion board SSD1306 I2C OLED
~ ArduinoBLE between Nano RP2040 Connect (Peripheral LED) and XIAO BLE Sense (Central LedControl)
~ BLE between Nano RP2040 Connect and XIAO BLE Sense, using ArduinoBLE in Arduino Framework.

~ CircuitPython 7 on Seeed XIAO BLE Sense and more examples...