Create README.md

README.md

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+---
+title: Norwegian Plan Extractor (FastAPI)
+emoji: 🏛️
+colorFrom: blue
+colorTo: indigo
+sdk: docker
+pinned: false
+---
+
+FastAPI service exposing:
+
+- `GET /health`
+- `POST /extract_json` — body: `{"pdf_url": "<url>", "plot_size_m2": "1200"}` (plot size optional)
+- `POST /extract_file` — multipart: `file=@file.pdf`, `plot_size_m2=1200` (optional)
+
+**Env required**
+- `OPENAI_API_KEY`