docs(readme): add banner for Playwright 1.27 discussion

Author: jrolfs

README.md

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+> 😲 **Heads up** — Playwright introduced native Testing Library queries in version **[1.27](https://playwright.dev/docs/release-notes#locators)**.
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+> 💬 [**#558**](https://github.com/testing-library/playwright-testing-library/issues/558) ← We're discussing what this means for Playwright Testing Library in [this issue](https://github.com/testing-library/playwright-testing-library/issues/558). You can find a more detailed comparison of the new Playwright API and this library [here](https://github.com/testing-library/playwright-testing-library/issues/558#issuecomment-1273969028). Please ask any questions you may have or share thoughts and suggestions!
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