TalentLMS lets you add users to your portal en masse. You just need to go to the Import at your Administrator's dashboard. Then, drop your import file in it or you may also copy and paste your data into the description box.
You may refer to these articles on the steps to use import:
How to add multiple users to the portal using import?
How to assign multiple users to a group using import?
How to assign a course to a group using import?