feat: initial rusty-telemetry UDP listener

- Async UDP listener on configurable bind address (default 127.0.0.1:5005)
- RUSTY_TELEMETRY_BIND env var for cross-machine deployment
- Deserializes JSON telemetry frames with serde
- deny_unknown_fields for schema drift detection
- ReceiveStats tracker with packet rate and data rate
- Locked stdout writes for efficient output
- .gitignore for /target/ and .idea/

README.md

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+# rusty-telemetry
+
+Sim racing telemetry receiver and analyzer. Phase 1 provides a simple UDP listener that receives JSON telemetry frames and prints them to stdout.
+
+## Build and Run
+
+```bash
+cargo run
+```
+
+The listener binds to `0.0.0.0:5005` and expects UDP packets containing JSON with the following structure:
+
+```json
+{
+  "timestamp": 1716123456.789,
+  "speed_kmh": 245.3,
+  "rpm": 8750,
+  "gear": 6,
+  "throttle": 0.85,
+  "brake": 0.0,
+  "steering": 0.12,
+  "g_forces": { "x": 0.5, "y": -0.2, "z": 1.0 },
+  "wheel_slip": [0.1, 0.1, 0.0, 0.0],
+  "suspension_travel": [0.15, 0.14, 0.16, 0.15],
+  "lap_time": 85.234,
+  "lap_count": 5
+}
+```
+
+Press Ctrl+C to stop.
+
+## Testing
+
+Send a test packet from another terminal:
+
+```bash
+echo '{"timestamp":1.0,"speed_kmh":100.0,"rpm":5000,"gear":3,"throttle":0.5,"brake":0.0,"steering":0.0,"g_forces":{"x":0.0,"y":0.0,"z":1.0},"wheel_slip":[0.0,0.0,0.0,0.0],"suspension_travel":[0.1,0.1,0.1,0.1],"lap_time":60.0,"lap_count":1}' | nc -u -w0 127.0.0.1 5005
+```
+
+## Future Plans
+
+- Telemetry parsers for multiple sim formats
+- Persistent storage (SQLite or similar)
+- Real-time dashboard / web API
+- Lap analysis and comparison tools