The random number is the md5 crypted password. If you manually create the first user for example with password "start", then you can simply copy&paste the md5 crypted password string for the rest of your users.
# user:MD5password:Real Name:email:groups,comma,seperated
user01:21232f297a57a5a743894a0e4a801fc3:user01:user01@localhost:user
user02:21232f297a57a5a743894a0e4a801fc3:user02:user02@localhost:user
user03:21232f297a57a5a743894a0e4a801fc3:user03:user03@localhost:user
user04:21232f297a57a5a743894a0e4a801fc3:user04:user04@localhost:user
.
.
.
.
user99:21232f297a57a5a743894a0e4a801fc3:user99:user99@localhost:user
Or use a md5 password generator:
http://www.miraclesalad.com/webtools/md5.php