Add geoclue configuration man page

Fixes #49
4 jobs for master in 4 minutes and 25 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #219738
ubuntu-16.04

00:04:20

passed #219739
ubuntu-17.10

00:04:25

passed #219740
ubuntu-18.04

00:02:04

passed #219741
ubuntu-18.04-no-backend

00:03:47