Recommender module test + AppConfig moved

See merge request !9

Resolve "Write tests for core module"

See merge request !7

Resolve "Generate openAPI for all modules"

See merge request !8

Resolve "Write tests for login module"

See merge request !6

Resolve "Create login module"

See merge request !5

Resolve "Create recommender module"

See merge request !4

Added swagger to project

See merge request !3

Created basic structure of core module

See merge request !2

Readme and diagrams

See merge request !1