Merge branch 'master' of ssh://gitup.uni-potsdam.de/nifranz/rse-23-group-assignment-shervud-pitawanik-franz

Resolve "Set up Sphinx for documentation": added Sphinx documentation

Closes #24

See merge request !14

Resolve "requirements.md: User requirements"

Closes #12

See merge request !13

Merge "Write tests" branch into master

Closes #18

See merge request !12

Merge #19-logging into into master

Closes #19

See merge request !10