This is an Enterprise plan feature
For the enterprise solution of ReadMe, we provide user roles, to enable administrators access to various permissions. Here they are, and what they do.
Admin - This type of member can invite/remove other members from the project. They can also add/remove projects from the enterprise group. They also have every privilege that a copywriter has.
A Readonly member does not have access to the project via the dashboard. However, they have access to hubs of the projects. A readonly member is designed to allow non-internal members (your clients) access to your project.