Add link to readthedocs in the README displayed in Gitlab

See merge request !21

Fix problems with CI

See merge request !20

Build error with gcc 11

See merge request !19

Remove under construction warning

See merge request !18

Fix wrong group traffic light colors

See merge request !17

Improves docs: Adds license, includes example ATC and adds smaller improvements

See merge request !16

Generate documentation with sphinx

See merge request !15

Improve / extend README with goals and motivation, as well as info about return code

See merge request !11

Customizable group names

See merge request !14

Fix skipped test not correctly added to xml output

See merge request !13

Improve html result summary

See merge request !12

Updates README (wording, smaller improvements)

See merge request !10

Remove unused lib functions

See merge request !8

Dockerize autotester

See merge request !5