docs: add badge, description to README.md

README.md

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+[![codecov](https://codecov.io/gh/sitepark/atoolo-runtime-check-bundle/graph/badge.svg?token=hO7bDPmuKt)](https://codecov.io/gh/sitepark/atoolo-runtime-check-bundle)
 ![phpstan](https://img.shields.io/badge/PHPStan-level%209-brightgreen)
 ![php](https://img.shields.io/badge/PHP-8.1-blue)
 ![php](https://img.shields.io/badge/PHP-8.2-blue)
 ![php](https://img.shields.io/badge/PHP-8.3-blue)
+[![E2E Test](https://github.com/sitepark/atoolo-e2e-test/actions/workflows/e2e-test.yml/badge.svg)](https://github.com/sitepark/atoolo-e2e-test/actions/workflows/e2e-test.yml)
 
 # Atoolo runtime check bundle
 
+Symfony bundle which contains tools that can be used to check whether the current runtime environment is set up as expected.
+
 [Documentation](https://sitepark.github.io/atoolo-docs/develop/bundles/runtime-check/)