There are multiple options you can create an csv sheet with the user details and use workbench or data loader to upload them. You can also use add multiple user option in salesforce. https://help.salesforce.com/apex/HTViewHelpDoc?id=users_adding_multiple.htm&language=en
You can quickly add up to 10 users at a time to your organization. Your Salesforce edition determines the maximum number of users that you can add.
Available in: Professional, Enterprise, Performance, Unlimited, Developer, and Database.com Editions
To create users:
1) From Setup, enter Users in the Quick Find box, then select Users. 2) Click Add Multiple Users. 3) If multiple user license types are available in your organization, select the user license to associate with the users you plan to create. The user license determines the available profiles. 4) Specify the information for each user. 5) To email a login name and temporary password to each new user, select Generate passwords and notify user via email. 6) Click Save.
To specify more details for the users that you’ve created with this method, edit individual users as needed.
You can also use add multiple user option in salesforce.
https://help.salesforce.com/apex/HTViewHelpDoc?id=users_adding_multiple.htm&language=en
Hi Uma K 1,
Add Multiple Users:
You can quickly add up to 10 users at a time to your organization. Your Salesforce edition determines the maximum number of users that you can add.
Available in: Professional, Enterprise, Performance, Unlimited, Developer, and Database.com Editions
To create users:
1) From Setup, enter Users in the Quick Find box, then select Users.
2) Click Add Multiple Users.
3) If multiple user license types are available in your organization, select the user license to associate with the users you plan to create. The user license determines the available profiles.
4) Specify the information for each user.
5) To email a login name and temporary password to each new user, select Generate passwords and notify user via email.
6) Click Save.
To specify more details for the users that you’ve created with this method, edit individual users as needed.
Kindly mark it as solved if it helps you.
Best Regards,
Rakesh.T