Merge branch...

Merge branch '96-update-contributors-guide-and-move-it-at-top-level-so-it-s-recognised-by-gitlab' into 'master'

Update contributor's guide and move it to top level, so it's recognized by GitLab

Closes #96

See merge request !58
4 jobs for 120-bind-9-11-addzone-fails in 11 minutes and 19 seconds (queued for 22 seconds)
Status Job ID Name Coverage
  Build
passed #2623
linux docker
build:debian:sid:amd64

00:04:50

passed #2624
linux docker
build:debian:sid:i386

00:05:16

 
  Test
passed #2625
linux docker
test:debian:sid:amd64

00:06:01

passed #2626
linux docker
test:debian:sid:i386

00:06:01