Запрос на слияние 'new' (#2) из new в master

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

update README.md

create README.md

create demo/demo_report.md

update README.md

create README.md

create demo/demo_report.md

create demo/README.md

create demo/routes.csv

create demo/airports.csv

update dev/solution.cs

update dev/program.cs

delete demo

create demo

create dev/solution.py

create spec/codex.md