create spec/codex.md

update demo/review

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

update assignment.py

delete CONTRIBUTING.md

delete FILE_UPDATE_REPORT.md

update README.md

update assignment.py

delete CONTRIBUTING.md

delete FILE_UPDATE_REPORT.md

update README.md

update README.md

create README.md

delete scripts/PANDAS_CHEATSHEET.md

delete scripts/MATPLOTLIB_CHEATSHEET.md

delete scripts/CODE_REQUIREMENTS.md

delete scripts/ASSIGNMENTS_README.md