framework fingerprint reader expansion module

i want biometric unlock on my framework 12 laptop but it doesn't even have room for a power button by the keyboard, let alone a fingerprint sensor. i found out you can buy a Framework Laptop 16 Fingerprint Reader Kit, so i did, and i want to make my first ever USB type-C expansion module supported by all framework devices using it. i'm keeping all my notes and project files and everything else in this repo as i figure out what i'm doing.

i'm going to pick up where the people in this forum thread left off.