Add passivemodding to team-external-students

[PassiveModding]

Description

As part of the pathways dojo 2022

Exercise (e.g. C01-E01):

Student Name:

A brief explanation of what has been done.

Type of change

• [x] Exercise Submission (one exercise per PR)
  • [x] This PR is just for one exercise of a class
  • [ ] PR name follows the pattern <github-username>/<exercise-number>
  • [ ] Added exercise files inside folder /classes/<class- number>/exercises/<exercise-number>/<github-username>/
    • [ ] Review exercise submission steps
• [ ] Class content (instructors/admins)
• [ ] Documentation update
• [ ] Repo management