document the autofs5 plugin

hello,

now that we have a fonctional autofs5 plugin it must be documented in the official documentation

Cheers

changed due date to June 05, 2020

changed milestone to %FusionDirectory 1.4

added plugin-autofs label

changed the description

added PJ2003-0342 label

marked this issue as related to fd-plugins#2912 (closed)

changed the description

removed due date

assigned to @jswaelens and unassigned @ppenati

added user-manual label

changed milestone to %FusionDirectory 1.6

changed time estimate to 2h