change: tools.php

Create: gradient_generator.php

Create: index.php, uuid_generator.php, subnet_calculator.php

update: SECURITY.md

create: SECURITY.md

update: CONTRIBUTING.md

create: CONTRIBUTING.md

update: CODE_OF_CONDUCT.md

create: CODE_OF_CONDUCT

update: README.md

Улучшение структуры кода!

update: index.php

create: password_meter.php, markdown.php, regex.php, diff_checker.php

fix: remove ignored files from repository

Initial commit

Первый коммит

create timestamp.php