Make a csv file -a text file or an Excel file which you save as csv - use the fields username, password, firstname, lastname,course1 and for the field course1 put in the shortname of the course you want to enrol your users into, Then add your users to the list and then go to site admin>users>upload users and there is a place to browse for and add your users in bulk there. It doesn't matter if they are already in the system as you can select to "Update existing users"
Enrolment
Enrolling user in Course
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