docs: add README with deployment instructions

README.md

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+# Netbox Deployment
+
+GitOps deployment for Netbox with Tailscale HTTPS access.
+
+## Prerequisites
+
+### PostgreSQL Database
+
+Connect to your PostgreSQL server and create the database:
+
+```sql
+CREATE DATABASE netbox;
+CREATE USER netbox WITH PASSWORD 'your-secure-password';
+GRANT ALL PRIVILEGES ON DATABASE netbox TO netbox;
+ALTER DATABASE netbox OWNER TO netbox;
+```
+
+### Tailscale Configuration
+
+Download the serve configuration (first time only):
+
+```bash
+curl -o serve-config.json https://gitea.arnodo.fr/Damien/netbox-deployment/raw/branch/main/serve-config.json
+```
+
+Place `serve-config.json` in the stack directory before deployment.
+
+### Generate Secret Key
+
+```bash
+python3 -c "import secrets; print(secrets.token_urlsafe(50))"
+```
+
+## Portainer Environment Variables
+
+| Variable | Description |
+|----------|-------------|
+| `TS_AUTHKEY` | Tailscale auth key (reusable, ephemeral recommended) |
+| `DB_PASSWORD` | PostgreSQL password for netbox user |
+| `SECRET_KEY` | Django secret key (generate with command above) |
+| `SUPERUSER_NAME` | Initial admin username |
+| `SUPERUSER_EMAIL` | Initial admin email |
+| `SUPERUSER_PASSWORD` | Initial admin password |
+| `SKIP_SUPERUSER` | Set to `true` after first deployment |
+
+## Deployment
+
+1. Create a new stack in Portainer
+2. Point to this repository
+3. Configure environment variables
+4. Deploy
+
+## Access
+
+Once deployed: https://netbox.taila5ad8.ts.net