Provide a flag to mark team members as "associate team members"

Project HIFIS Software has associate members not directly part of the team, e.g. lecturers. We would like to set a flag if members are associate team members. This flag can be used for additional layouting of the team page. For example:

• Add an "associate team member" badge to associate team members.
• Separate associate team members from actual/core team members.