Enhance README file

Exclude sensitive files and update .gitignore

updated to latest flutter version

changed database structure to support multiple credit and unit tests counter

added option menu to choose semester, change in database structure to support semester

fixed long complete module names

added recognition of completed exams

fixed no module bug, added extended time info

added app icon

changed login / registration text

added room, time and zoom URL support

fixed dismissing in moduleswipe

added dismissing feature to module menu

added profile stream to dashboard, auto-refreshing status information

added cropping to schedule module c ards