Added Seeed Studio Xiao RP2040 support

[b-]

(really, I just added pin assignments, added a photo of my hid-remapper on a Xiao, and changed the wording to be a little more board-agnostic)

[rusty-bits]

you may also want to include the syntax for the cmake instruction so it will build with the definitions for the seeed-xiao-rp2040

PICO_BOARD=seeed_xiao_rp2040 cmake ..  
make  

this way things like the status light on the seeed will work correctly

[b-]

you may also want to include the syntax for the cmake instruction so it will build with the definitions for the seeed-xiao-rp2040

PICO_BOARD=seeed_xiao_rp2040 cmake ..  
make  

this way things like the status light on the seeed will work correctly

Hey, thanks! I didn’t know this was a thing, and I figured that I’d just have to either manually reassign the LED or deal with it not working right on this board.

Actually, I didn’t even realize what the LED was supposed to do because I didn’t try this software on a Pi Pico until after already trying it on a Xiao :)

I’ll make a point of adding and testing that in the near future. Thanks again!