Add Read-Only user in AWS IAM

1) Navigate to AWS IAM in the AWS console.
Click on Users.

2) Click on Add user.

3) Enter in details for "User name", Check tick box for "AWS Management Console access", Create password, and click on "Next: Permissions".

4) Select "Attach existing policies directly", Search for "ReadOnlyAccess", check the tickbox next to "ReadOnlyAccess", and click "Next: Tags".
Tags are optional so you can skip through by clicking on "Review".