Add model for B1 Pro Ultra slim

[rene-inform]

Request Type

Missing file for existing model

Model

B1 Pro Ultra slim

Description

https://www.keychron.com/collections/scissor-switch-keyboards/products/keychron-b1-pro-ultra-slim-wireless-keyboard

Ideally in German ISO Layout, but I guess for CAD that doesn't really matter :)

Thank you!

[Keychron-Milly]

okay, we will add it next week