Investigate Google Calendar API

[biblicalph]

Is your feature or refactor request related to a problem? Please describe.
We'd like to know the following:

1. How to obtain application keys
2. How to obtain permanent user access tokens
3. How to determine if a user access token has been revoked or is expired
4. How to get the items on a user's calendar
5. How to add an entry to a user's calendar
6. How to determine if a user's calendar is open for a given time of a given day

[biblicalph]

https://developers.google.com/calendar/overview

[biblicalph]

https://developers.google.com/calendar/quickstart/nodejs