Add project documentation

docs/roadmap.md

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+# Project Roadmap
+
+## Phase 1 — Simulator
+
+Status: Complete
+
+Features:
+- Dashboard UI
+- Alarm System
+- Sensor Simulation
+- RS-485 Simulation
+- Protocol Layer
+
+## Phase 2 — Pico Dashboard
+
+Status: Pending
+
+Features:
+- 3.5" Touchscreen
+- Native Dashboard UI
+- Sleep/Wake Functionality
+
+## Phase 3 — ESP32 Controller
+
+Status: Pending
+
+Features:
+- Relay Control
+- RS-485 Communications
+- Configuration Storage
+
+## Phase 4 — DS18B20 Sensors
+
+Status: Pending
+
+Features:
+- Fridge Monitoring
+- Rear Seat Monitoring
+- Outside Temperature
+
+## Phase 5 — JBD BLE Integration
+
+Status: Pending
+
+Features:
+- SOC
+- Voltage
+- Current
+- Remaining Ah
+- Cell Voltages
+
+## Phase 6 — Vehicle Telemetry
+
+Status: Pending
+
+Features:
+- OBD-II
+- CAN Bus
+- RPM
+- Coolant Temperature
+- Fuel Level
+
+## Phase 7 — Integrations
+
+Status: Future
+
+Features:
+- MQTT
+- Home Assistant
+- Grafana
+- InfluxDB