You can create loads of users and add them to groups all in one go with a single csv file you can prepeare in Excel for example.

A Client capable of running powershell (At least Windows 7) and a administrative connection to the AD-Server

Download the script, prepeare the csv (examples are provided) in the script edit the splitters if needed (they are set for standard excel csv export) and then run the poewrshell script and enter the path of the csv file. (You may have to allow script execution on the device) The rest should be done by the script.