Well , how would you like it to work ??
Read lines from a file with user-names and passwords ?
One tip is to create a file that looks like somethings like this
-------
user 1 - p abc
user 2 -p def
(and so on)
-----------
and then do a one liner from the shell
cat userfile.txt | awk '{print "adduser " , $0}' | sh
ps. The adduser option can be different on your system, it's not the same for all dist, just check yours with adduser --help or useradd or whatever