No user on brand new OS X installation
Definitely a strange situation, however there's a relatively easy solution.

Boot to single user mode as you did before by holding ⌘S while power it on.

Once you reach the command prompt you can enter the following commands, pressing return after each one:

/sbin/fsck -fy
/sbin/mount -uw /
rm /var/db/.AppleSetupDone
reboot


This will remove the file that OS X checks for when booting to determine if the Mac has already been setup.  When it fails to detect the file it will start the setup assistant, which includes the step that allows you to create your user account.