Feature Request: Seeed Studio XIAO nRF52840 support

[Jason-Voxdale]

What kind of issue is this?

• Feature Request.

Would it be possible to add Arduino framework support for the Seeed Studio XIAO nRF52840 and Seeed Studio XIAO nRF52840 Sense boards? These boards are currently supported in Arduino IDE, so it's possible to borrow the variant files for it. The MCU, an nF52840, is also already supported in framework-arduinonordicnrf5. I've tried getting it working myself, and was able to get an example project to build with only minor tweaks, but ran into some issues during linking that I couldn't resolve.

Seeed documentation: link

[mestrode]

requires #151

[rishyak]

@ivankravets do you have any update on merging #151?