This PR is the result of discussion in
https://discourse.llvm.org/t/rfc-what-to-do-regarding-the-flang-call-notes-document/89450.
The intent with this PR is to move away from the former Google Doc in
favor of keeping the call notes in the primary repository. This PR has
the boilerplate and the notes from the last few meetings. In future,
notes from previous calls could be added in as well, once recovered from
the corrupted document.
The intended flow going forward would be for the call organizer to draft
the meeting's agenda in the working Google Doc referenced in
MeetingNotes/README.md, post it on Slack the day before the meeting,
take notes in the document during the call, then translate those notes
into a new notes document in the correct folder after the call is
completed and create a PR.
