Install davical-doc by entering the following commands in the terminal:
sudo apt update sudo apt install davical-doc
PHP CalDAV and CardDAV Server - technical documentation
The DAViCal CalDAV Server is designed to store CalDAV calendars and CardDAV addressbooks, such as those from Evolution, Sunbird/Lightning, Mulberry, iCal, iPhone or SOHO Organizer, in a central location, providing shared calendars, free/busy publication and a basic administration interface. . This package contains detailed technical documentation for the classes and methods in the DAViCal programs. Some user-centric configuration documentation is also included.