Запрос на слияние 'dev' (#12) из dev в master

chore: add license

chore: add license

chore: add license

Запрос на слияние 'dev' (#11) из dev в master

fix

fix

fix

Запрос на слияние 'dev' (#10) из dev в master

feat: change color

feat: change color

feat: change color

feat: cleaning

merge

title of empty list students added

feat: delete students function added

fix: variant page

Запрос на слияние 'dev' (#9) из dev в master

feat: cleaning

merge

title of empty list students added

feat: delete students function added

feat: cleaning