Document supported RFCs

[dilyanpalauzov]

• Fill at https://en.m.wikipedia.org/wiki/Comparison_of_CalDAV_and_CardDAV_implementations -> Server implementatioms what protocols NextCloud supports, possibly adding new columns.

• Create a list of all supported standards by NextCloud, like https://www.cyrusimap.org/imap/rfc-support.html

[MorrisJobke]

cc @icewind1991 @rullzer

[MorrisJobke]

@schiessle

[szaimen]

cc @nextcloud/community-mgmt who would be able to contribute/write such a list? Is this feasible?

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