[Keyboard] Initial firmware and keymaps for the CO60 PCB (#5959)
* Add: Initial firmware and keymaps for the CO60 PCB
* Apply suggestions from code review
Co-Authored-By: noroadsleft <18669334+noroadsleft@users.noreply.github.com>
Co-Authored-By: Drashna Jaelre <drashna@live.com>
Co-Authored-By: fauxpark <fauxpark@gmail.com>
* Update: Address reviewer comments
* Apply suggestions from code review
Co-Authored-By: Drashna Jaelre <drashna@live.com>
* Update: Reviewer changes
John M Daly