Add compression as a per-session extra exercise

[richelbilderbeek]

At our last meeting we decided to add compression as an extra exercise per session. That is, instead of having a separate session on compression, add it as an extra exercise too a session

• RB: add to rsync
• RB: add to FileZilla
• BC: add to scp
• BC: add to his other sessions

[richelbilderbeek]

BC is done, so I unassign him here 👍