update readme with mode and fps ranges

1 job for release/v0.0.5 in 37 seconds
Status Job ID Name Coverage
  Build Stage
failed #1003141144
build

00:00:37

 
Name Stage Failure
failed
build Build Stage
elif [ -x /busybox/sh ]; then
exec /busybox/sh
else
echo shell not found
exit 1
fi

'
ERROR: Job failed: exit code 1