What are project roles?
Project roles are a flexible way to associate users and/or groups with particular functions and projects. Users are assigned project roles by the project lead, and these roles are used in permission schemes to assign permissions to a user.
Project leads can grant people or groups specific access and additional roles in their project:
From your project's sidebar, select Project settings > Access.
Select Add people.
Type a name, group, or email address.
Select the person's role in your project from the Role dropdown.
Project Lead, Project Team, Read Only - See permission scheme for the permissions associated with each of those roles. In general, Project Leads should assign the Project Team role to the people working on the tasks in the project, Read Only to the people that they want to see the work being done, and Project Lead to other people on the team that they want to have the same permissions they have.
Select Add.