docs: readme contributing/author/license; add CONTRIBUTING.md

Drop Brand images section; fix issue links to md2pdf repo.

Author: marcop135

CONTRIBUTING.md

@@ -0,0 +1,26 @@
+# Contributing
+
+Thanks for your interest in **Markdown2PDF**.
+
+## Issues
+
+Bug reports and feature requests are tracked on [GitHub Issues](https://github.com/marcop135/md2pdf/issues). Include steps to reproduce, expected vs actual behavior, and your browser or OS when reporting bugs.
+
+## Pull requests
+
+1. Fork the repo and create a focused branch (`feature/…` or `fix/…`).
+2. Match existing code style (formatting, patterns, naming).
+3. Run **`yarn test`** before pushing; **`yarn build`** should succeed for UI changes when relevant.
+4. Keep commits and the PR description clear; link related issues when applicable.
+
+## Attribution
+
+This project derives from [realdennis/md2pdf](https://github.com/realdennis/md2pdf) (MIT). Respect upstream licensing and preserve copyright notices where you touch substantial upstream-derived files.
+
+## What we are unlikely to merge
+
+- Breaking changes without discussion.
+- Dependencies that materially grow the bundle without clear benefit for this offline-first scope.
+- Server-side uploads or backends (out of scope for this app).
+
+Questions are welcome via issues before large refactors.

README.md

@@ -112,19 +112,18 @@ graph TD
 | `yarn test`    | Run tests                          |
 | `yarn preview` | Preview production build (`dist/`) |
 
-## Contributing
+## 🤝 Contributing
 
-1. Fork the repository.
-2. Create a branch: `git checkout -b feature/your-feature`.
-3. Commit: `git commit -m 'Describe your feature'`.
-4. Push: `git push origin feature/your-feature`.
-5. Open a pull request.
+Contributions welcome! Please read [CONTRIBUTING.md](./CONTRIBUTING.md) for guidelines on how to contribute.
 
-## Brand images
+- 🐛 Found a bug? [Open an issue](https://github.com/marcop135/md2pdf/issues)
+- 💡 Have a feature request? [Open an issue](https://github.com/marcop135/md2pdf/issues)
+- 📝 Want to contribute? [Read the contributing guide](./CONTRIBUTING.md)
 
-- [`docs/readme-hero.png`](docs/readme-hero.png) banner used at the top of this README (UI mockup of the editor and preview).
-- [`docs/github-social-preview.png`](docs/github-social-preview.png) for the repository share card on GitHub: **Settings → General → Social preview → Edit** and upload this file (wide image, suitable for repo links and Open Graph-style previews).
+## 👤 Author
 
-## License
+[Marco Pontili](https://marcopontili.com)
 
-MIT
+## 📝 License
+
+Licensed under the [MIT](./LICENSE) License.