Add Docker Compose setup for self-hosted Shlink on Coolify

README.md

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+# Shlink — self-hosted URL shortener
+
+Deployed on [Coolify](https://coolify.io) via Docker Compose.
+
+## Coolify setup
+
+1. Create a new resource → **Docker Compose** → point to this repo.
+2. In the Coolify environment variables UI, set the values from `.env.example`:
+   - `DEFAULT_DOMAIN` — your short URL domain (e.g. `s.example.com`)
+   - `DB_PASSWORD` — strong random password
+   - `INITIAL_API_KEY` — initial API key (`openssl rand -hex 32`)
+   - `TIMEZONE` — your timezone
+3. Add a domain in Coolify pointing to port `8080`.
+4. Deploy.
+
+## Shlink Web UI
+
+Optionally connect [shlink-web-client](https://app.shlink.io) to your instance using your domain and API key.