A new User guide for Grottocenter

With the new site for grottocenter, a new user guide was needed.

GrottoCenter is a community database dedicated to speleology and fed by speleologists on the principle of Wiki, that is to say that the content of the site can be modified by all registered users.
It is therefore a source of speleological data, easily accessible, which is waiting for only one thing: that you complete it!
This document explains how to use Grottocenter. It is also a wiki document, so you can contribute to its update and its translation.

It is now available https://wiki.grottocenter.org/wiki/GrottoCenter:En/User_Guide