[Keyboard] Add new keyboard Symmetry60 (#7327) ...By: James Young <18669334+noroadsleft@users.noreply.github.com> ...By: James Young <18669334+noroadsleft@users.noreply.github.com> ...By: James Young <18669334+noroadsleft@users.noreply.github.com> ...By: James Young <18669334+noroadsleft@users.noreply.github.com> ...By: James Young <18669334+noroadsleft@users.noreply.github.com>