update spec/codex.md

update README.md

update spec/codex.md

update README.md

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

update dev/solution.cs

create dev/solution.cs

delete docs.md

delete PRD.md

delete demo/screen.png

upload files

create demo/screen.png

update dev/solution.cs

delete docs.md

delete PRD.md

delete tasks.md