refactor(greeter): move to app/ and patch behaviour

test: multi-analyzer fixtures for smoke

chore: seed legacy/utils.py for smoke-test fixtures

chore: seed legacy/greeter.py for smoke-test fixtures

Запрос на слияние 'smoke/add-hello' (#1) из smoke/add-hello в master

feat: hello() helper

feat: hello() helper

docs: README

docs: README