Unixcop published a tutorial showing you how to add an user to sudoers and give him root permissions.

How to add an user to sudoers and give him root permissions

 A question that many novice users don’t ask is how to add a user to sudoers. This is to give that new user the ability to use sudo and thus execute commands as root user. The sudoers file As we know, sudo is a utility of Unix-like operating systems, such as GNU/Linux

How to add an user to sudoers and give him root permissions - Unix / Linux the admins Tutorials