Quick and simple guide to creating a sudo user with Linux (ubuntu 16.04 in this instance).

Create the user

Note you'll need to login as a user with sudo privileges for the following.

Create the user

sudo adduser <username>

Follow on-screen directions for creating a password etc.

Add user to sudo group

Add the user you just created to the sudo group (which allows them to use the sudo command) by:

usermod -aG sudo <username>