update dev/solution.cs

update dev/solution.cs

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

create spec/codex.md

create dev/solution.cs

docs: add contribution variant for branch refs/heads/brbr

create demo/test.txt

delete tasks/task_variants.md

delete CONTRIBUTING.md

update dev/solution.cs

create README.md

create dev/solution.cs