docs: add README

README.md

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+# libretranslate
+
+Self-hosted [LibreTranslate](https://libretranslate.com) deployment — a free, open-source machine translation API. Used for translating church names, addresses, and mass schedule text in the **ScraperControl** pipeline.
+
+## Service
+
+| Service | Port | Description |
+|---------|------|-------------|
+| `libretranslate` | `15000` → `5000` | LibreTranslate translation API |
+
+## Loaded Languages
+
+Only these languages are loaded at startup (`LT_LOAD_ONLY`):
+
+| Code | Language |
+|------|----------|
+| `en` | English |
+| `th` | Thai |
+| `tl` | Filipino (Tagalog) |
+| `id` | Indonesian |
+| `ms` | Malay |
+
+These cover the Southeast Asian language churches targeted by ScraperControl importers (`import-mass-schedules-ph.ts`, `import-philmass.ts`).
+
+## API
+
+**Translate text:**
+```bash
+curl -X POST http://192.168.0.241:15000/translate \
+  -H "Content-Type: application/json" \
+  -d '{"q": "Misa ng Bata", "source": "tl", "target": "en"}'
+```
+
+**List available languages:**
+```bash
+curl http://192.168.0.241:15000/languages
+```
+
+**Web UI:** `http://192.168.0.241:15000` (enabled)
+
+## Running
+
+```bash
+docker compose up -d
+```
+
+Note: First startup downloads language models (~several minutes). The healthcheck has a 300 s start period to account for this.
+
+## Data Persistence
+
+Language models and translation data are persisted in the Docker volume `libretranslate_data` (`/home/libretranslate/.local`).
+
+## Deployment
+
+Runs on `192.168.0.241` (albert-MacBookPro Linux server).
+
+**Docker Compose:** `/opt/docker/libretranslate/docker-compose.yml`
+
+| Endpoint | URL |
+|----------|-----|
+| Translation API | `http://192.168.0.241:15000` |
+| Web UI | `http://192.168.0.241:15000` |