Add a slide on [[attributes]]

[bernhardmgruber]

There is one slide on the [[fallthrough]] attribute, but I think we should discuss attributes in general and mention the few other standard ones.

[stale[bot]]

This issue or pull request has been automatically marked as stale because it has not had recent activity. Please manually close it, if it is no longer relevant, or ask for help or support to help getting it unstuck. Let me bring this to the attention of @klieret @wdconinc @michmx for now.