Add tutorial for rp2040 Pico boards and MicroPython

[prcutler]

This PR adds a tutorial for using Raspberry Pi Pico boards using MicroPython. I used similar language from the Adafruit CircuitPython page.

This is my first time submitting a tutorial, so if it needs any changes, just let me know and I'm happy to update the PR.

Thanks!

[carlosperate]

This is great, thanks @prcutler!
We also need to add a card in en/tutorials/1.1/index.html, would you like to do that too?

[ntoll]

@prcutler now the new release is out the door, we can focus on docs... and your contributions like this are invaluable. Bravo. 🎉

[prcutler]

This is great, thanks @prcutler! We also need to add a card in en/tutorials/1.1/index.html, would you like to do that too?

Sure! I'll have some time next week and I'll update the PR.

[prcutler]

I've added the card and put it after the ESP32 card. I wasn't sure what image to use - for now it links to the rp2040 buttons, but it might be nice to get a picture of a Pico or Pico W to make it similar to the ESP and Adafruit cards sometime in the future.