Add README (#12)

Author: mfisher87

README.md

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+# [GeoJupyter.org](https://geojupyter.org)
+
+The official website for GeoJupyter.
+To learn more about GeoJupyter itself, visit the website!
+
+
+## Contributing
+
+This is a [Quarto](https://quarto.org) project.
+The development environment is managed by [Pixi](https://pixi.sh).
+
+
+### Start a local preview server
+
+```bash
+pixi run preview
+```
+
+This will start a local preview server.
+View your changes immediately in your browser!
+Any changes to the website content will trigger an automatic re-render.
+
+
+### Render the website
+
+```bash
+pixi run render
+```