docs: add README

beentogether/README.md

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+# beentogether
+
+Been Together — a small website celebrating time spent together with music and photos.
+
+Static page; open `index.html` in a browser or host on any static file server.
+
+## Structure
+
+- `index.html` — main page
+- `style.css` — styles
+- `main.js` — interactions
+- `img/` — photos
+- `music/` — audio
+
+## License
+
+Apache-2.0