Запрос на слияние 'my_vetka' (#1) из my_vetka в master

update README.md

update README.md

create demo/art.md

delete art.png

update README.md

update README.md

create demo/art.md

delete art.png

upload files

create README.md

update dеv/sоlutіоn.сs

create spec/codex.md

update dеmо/art.md

create dеv/sоlutіоn.сs