Add minimal @astrojs/db readme (#10331)

packages/db/README.md

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+# @astrojs/db (experimental) 💿
+
+This **[Astro integration][astro-integration]** enables the usage of [SQLite](https://www.sqlite.org/) in Astro Projects.
+
+## Documentation
+
+Read the [`@astrojs/db` docs][docs]
+
+## Support
+
+- Get help in the [Astro Discord][discord]. Post questions in our `#support` forum, or visit our dedicated `#dev` channel to discuss current development and more!
+
+- Check our [Astro Integration Documentation][astro-integration] for more on integrations.
+
+- Submit bug reports and feature requests as [GitHub issues][issues].
+
+## Contributing
+
+This package is maintained by Astro's Core team. You're welcome to submit an issue or PR! These links will help you get started:
+
+- [Contributor Manual][contributing]
+- [Code of Conduct][coc]
+- [Community Guide][community]
+
+## License
+
+MIT
+
+Copyright (c) 2023–present [Astro][astro]
+
+[astro]: https://astro.build/
+[docs]: https://docs.astro.build/en/guides/integrations-guide/db/
+[contributing]: https://github.com/withastro/astro/blob/main/CONTRIBUTING.md
+[coc]: https://github.com/withastro/.github/blob/main/CODE_OF_CONDUCT.md
+[community]: https://github.com/withastro/.github/blob/main/COMMUNITY_GUIDE.md
+[discord]: https://astro.build/chat/
+[issues]: https://github.com/withastro/astro/issues
+[astro-integration]: https://docs.astro.build/en/guides/integrations-guide/