Add Sequoia to README.md

Uses same plist as Sonoma. Just needed `-e SHORTNAME=sequoia`. Works already, this PR just adds to the README.md ```bash docker run -it \ --device /dev/kvm \ -p 50922:10022 \ -v /tmp/.X11-unix:/tmp/.X11-unix \ -e "DISPLAY=${DISPLAY:-:0.0}" \ -e GENERATE_UNIQUE=true \ -e CPU='Haswell-noTSX' \ -e CPUID_FLAGS='kvm=on,vendor=GenuineIntel,+invtsc,vmware-cpuid-freq=on' \ -e MASTER_PLIST_URL='https://raw.githubusercontent.com/sickcodes/osx-serial-generator/master/config-custom-sonoma.plist' \ -e SHORTNAME=sequoia \ sickcodes/docker-osx:latest ```