Update README to use Caddy instead of nginx

Replace nginx reverse proxy configuration with Caddy configuration.
Caddy provides automatic SSL certificates and simpler configuration.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

README.md

@@ -0,0 +1,158 @@
+# No as a Service (NaaS)
+
+A lightweight, production-ready HTTP service that always says "no" in various formats.
+
+## Features
+
+- Minimal dependencies (pure Rust, standard library only)
+- Multiple response formats (text, JSON, XML, YAML, boolean)
+- Mobile-responsive web frontend
+- CORS support
+- Health check endpoint
+- Optimized for small binary size (~1MB)
+- Container-ready with health checks
+
+## API Endpoints
+
+- `GET /` - Web frontend
+- `GET /api/no` - Returns plain text "no"
+- `GET /api/no?format=json` - Returns `{"answer": "no"}`
+- `GET /api/no?format=bool` - Returns `false`
+- `GET /api/no?format=xml` - Returns XML response
+- `GET /api/no?format=yaml` - Returns YAML response
+- `GET /health` - Health check endpoint
+
+## Quick Start
+
+### Local Development
+
+```bash
+# Build and run locally
+cd naas
+cargo build --release
+PORT=8080 ./target/release/naas
+```
+
+Visit http://localhost:8080
+
+### Container Deployment with Podman
+
+```bash
+# Build container
+cd naas
+BUILDAH_FORMAT=docker podman build -t naas:latest -f Containerfile .
+
+# Run container
+podman run -d \
+  --name naas \
+  -p 8080:8080 \
+  --restart=always \
+  naas:latest
+
+# Check health
+curl http://localhost:8080/health
+```
+
+### Systemd Service Deployment
+
+1. **Setup user and directory:**
+```bash
+# Create service user
+sudo useradd -r -s /bin/false naas
+
+# Copy application files
+sudo mkdir -p /opt/naas
+sudo cp -r naas/* /opt/naas/
+sudo chown -R naas:naas /opt/naas
+```
+
+2. **Install systemd service:**
+```bash
+# Copy service file
+sudo cp naas/naas.service /etc/systemd/system/
+
+# Reload systemd and start service
+sudo systemctl daemon-reload
+sudo systemctl enable naas
+sudo systemctl start naas
+
+# Check status
+sudo systemctl status naas
+```
+
+3. **View logs:**
+```bash
+sudo journalctl -u naas -f
+```
+
+## Production Deployment to no.donothireus.com
+
+### Caddy Reverse Proxy Configuration
+
+```caddyfile
+no.donothireus.com {
+    reverse_proxy localhost:8080 {
+        header_up Host {host}
+        header_up X-Real-IP {remote_host}
+        header_up X-Forwarded-For {remote_host}
+        header_up X-Forwarded-Proto {scheme}
+    }
+}
+```
+
+### Full Production Setup
+
+1. **Deploy application** using systemd service (see above)
+
+2. **Configure Caddy** with the above Caddyfile configuration (SSL certificates are automatic with Caddy)
+
+3. **Restart services:**
+```bash
+sudo systemctl restart caddy
+sudo systemctl restart naas
+```
+
+## Performance
+
+- Binary size: ~1MB (release build with optimizations)
+- Memory usage: <10MB
+- Startup time: <100ms
+- Request latency: <1ms
+
+## Development
+
+### Building from Source
+
+```bash
+# Debug build
+cargo build
+
+# Release build with optimizations
+cargo build --release
+
+# Run tests
+cargo test
+```
+
+### Container Build Options
+
+```bash
+# Multi-platform build (if needed)
+podman build --platform linux/amd64,linux/arm64 -t naas:latest .
+
+# Build with specific Rust version
+podman build --build-arg RUST_VERSION=1.75 -t naas:latest .
+```
+
+## Security
+
+- Runs as non-root user (UID 1000)
+- Read-only container filesystem
+- No new privileges
+- All capabilities dropped except NET_BIND_SERVICE
+- Memory and CPU limits enforced
+- CORS headers properly configured
+
+## License
+
+MIT