Add weekly meeting notes

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

meetings/2021-12-21_weekly_meeting.md

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+# Weekly Meeting
+
+## Attendees
+
+* Anna
+* Greta
+* Christoph
+* Richard
+
+## Notes
+
+* New app responsibility: `contactsinteraction`, shipped with server and integrated in the repo
+* Still unclear when or who will put `calendar_resource_management` on the app store
+* Greta works on Mail attachment modal
+* Richard made the cdav-library a proper npm package, started itinerary performance improvements and has some ideas for the Calendar invitation acceptance from web
+* Anna works on query chunking and encoding issues
+* Discussed https://github.com/nextcloud/mail/issues/5884
+* Discussed https://github.com/nextcloud/server/pull/30354