Installation :

. Create a new module named WebusersImport and copy/paste this code

Use :
. Create a txt file an put each user on a line whith this organisation : Fullname;username;password;email
Fullname = john DO
username = jdo
password = your password not crypted (the module will crypt it in MD5)

file exemple :

user 1;user1;pwd1;user1@test.com
user 2;user2;pwd2;user2@test.com
user 3;util3;pwd3;user3@test.com
user 4;user4;pwd4;user4@test.com

. In the manager go to the module, select the file and click "Import"