Update adafruit_qtpy_rp2040.md

Including a link to the unofficial Arduino core.

Author: sctv

_board/adafruit_qtpy_rp2040.md

@@ -24,7 +24,7 @@ What can you pop into the QT port? How about [OLEDs](https://www.adafruit.com/?q
 
 Use any [SparkFun Qwiic](http://www.sparkfun.com/qwiic) boards! [Seeed Grove I2C boards](https://www.adafruit.com/product/4528) will also work with this adapter cable.
 
-**At the time of launch, there is no Arduino core support for the chip on this board. There is great [C/C++ support](https://github.com/raspberrypi/pico-sdk), an official [MicroPython port](https://github.com/raspberrypi/micropython), and a [CircuitPython port](https://circuitpython.org/downloads)!** We of course [recommend CircuitPython because we think it's the easiest way to get started](https://learn.adafruit.com/welcome-to-circuitpython) and it has support with most of our drivers, displays, sensors, and more, supported out of the box so you can follow along with our CircuitPython projects and tutorials.
+There is great [C/C++ support](https://github.com/raspberrypi/pico-sdk), unofficial (but really good) [Arduino support](https://github.com/earlephilhower/arduino-pico), an official [MicroPython port](https://github.com/raspberrypi/micropython), and a [CircuitPython port](/downloads). We of course [recommend CircuitPython because we think it's the easiest way to get started](https://learn.adafruit.com/welcome-to-circuitpython) and it has support with most of our drivers, displays, sensors, and more, supported out of the box so you can follow along with our CircuitPython projects and tutorials.
 
 Pinout and shape is [Seeed Xiao](https://wiki.seeedstudio.com/Seeeduino-XIAO/) compatible, with castellated pads so you can solder it to a PCB with a cut out to allow the bottom components some breathing room. In addition to the QT connector, we also added an **RGB NeoPixel** (with a controllable power pin to allow for ultra-low-power usage), **and both boot-mode and reset buttons** (great for restarting your program or entering the bootloader). This QT Py comes with loose 0.1" headers you can solder in for breadboard use