[RELEASE] Enhanced .editorconfig

What's Changed

• [DOCS] Update README.md with dev hints by @gilbertsoft in #20
• [TASK] Complete composer manifest by @gilbertsoft in #22
• [DOCS] Move warning about core synchronization by @gilbertsoft in #23
• [DOCS] Fix wrong folder by @gilbertsoft in #24
• [TASK] Add PHP 8.1 and nightly to CI by @gilbertsoft in #26
• [DOCS] Add YouTube link to README.md by @marble in #25
• [TASK] Sync .editorconfig with the latest TYPO3 Core version by @gilbertsoft in #28

New Contributors

• @marble made their first contribution in #25

Full Changelog: v0.5.0...v0.5.1