Polish project for public release

- Add requirements.txt with Python dependencies
- Add MIT LICENSE file
- Add screenshot for README
- Expand README with better documentation:
  - Quick start with git clone
  - Configuration example
  - Compatible receivers list
  - Custom backgrounds section
  - Credits section
- Update CONFIG.md:
  - Fix Quick Start checklist (add pip install step)
  - Add systemd service instructions for auto-start
- Remove CLAUDE.md from documentation list (dev-only file)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CONFIG.md

@@ -217,8 +217,61 @@ All aircraft sprites should face **right (east)** - the code flips them automati
 
 ## Quick Start Checklist
 
-1. [ ] Edit `config.json` with your receiver IP (or leave as AUTO)
-2. [ ] Set your location name, latitude, and longitude
-3. [ ] Replace `north.png`, `east.png`, `south.png`, `west.png` with your local views
-4. [ ] Start the server: `python3 server.py`
-5. [ ] Open browser to `http://your-server-ip:2001`
+1. [ ] Install dependencies: `pip install -r requirements.txt`
+2. [ ] Edit `config.json` with your receiver IP (or leave as AUTO)
+3. [ ] Set your location name, latitude, and longitude
+4. [ ] (Optional) Add custom backgrounds to `backgrounds/custom/` and set `"theme": "custom"`
+5. [ ] Start the server: `python3 server.py`
+6. [ ] Open browser to `http://your-server-ip:2001`
+
+---
+
+## Running as a Service (Auto-Start)
+
+To run Pixel-ADSB automatically on boot, create a systemd service:
+
+### 1. Create the service file
+
+```bash
+sudo nano /etc/systemd/system/pixel-adsb.service
+```
+
+Add this content (adjust paths as needed):
+
+```ini
+[Unit]
+Description=Pixel-ADSB Flight Tracker
+After=network.target
+
+[Service]
+Type=simple
+WorkingDirectory=/path/to/pixel-view
+ExecStart=/usr/bin/python3 /path/to/pixel-view/server.py
+Restart=always
+RestartSec=5
+StandardOutput=append:/var/log/pixel-adsb.log
+StandardError=append:/var/log/pixel-adsb.log
+
+[Install]
+WantedBy=multi-user.target
+```
+
+### 2. Enable and start the service
+
+```bash
+sudo systemctl daemon-reload
+sudo systemctl enable pixel-adsb
+sudo systemctl start pixel-adsb
+```
+
+### 3. Check status
+
+```bash
+sudo systemctl status pixel-adsb
+```
+
+### 4. View logs
+
+```bash
+tail -f /var/log/pixel-adsb.log
+```