Allen Porter 41754785b1 Add a CalendarEntity specification
Add documentation for CalendarEntity that describes the API, since it is currently ambiguous.

This proposes some specific behaviors around start/date times that may be inconsistent
which are inconsistent wiht some existing integrations as a path forward to making all
integrations have consistent behavior.
2022-03-31 18:17:38 -07:00
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2022-03-31 18:17:38 -07:00