Yes, as a project administrator you can add as many user roles as needed, but only with two different kinds of permissions.

• Editor
• Viewer  

How to add new user roles

• Click the gear icon in the sidebar to go to Project Settings.  
• Click the sub-section Users. 
• In the Roles card you see a system generated user role with Edit permission called Default.
• Click Add Role and create as many roles as needed. 
• Select between Edit or View in the permission field of each role.
• After creating new user roles, navigate to the user list and assign the appropriate roles to the users.
   

Where: HOME / <project name> / Project Settings / Users