upload files

create c_sharp/rectangle.cs

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

create demo/test.txt

create README.md

update dev/solution.cs

create dev/solution.cs

create demo/test.txt

create README.md

update dev/solution.cs

create dev/solution.cs

create spec/codex.md

create c_sharp/labirint.cs

update README.md

update README.md