Added Readme.md

README.md

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+# OTA Vehicle Simulator
+
+A .NET Console Application simulating a connected vehicle in the fleet. It mimics the lifecycle of an IoT device checking for OTA updates.
+
+## Functionality
+*   **Registration**: Automatically registers with the backend on startup using a generated or configured VIN.
+*   **Heartbeat**: Sends regular heartbeats to the backend to report "Online" status.
+*   **Poll for Updates**: Periodically queries the backend for available firmware updates relative to its current version.
+*   **Simulation**: Simulates the download and installation process (delays, status updates).
+
+## Configuration
+Inside `Program.cs` or `appsettings.json` (if added):
+*   **Backend URL**: Defaults to `http://localhost:5000`.
+*   **VIN**: Can be set via command line args or config; defaults to a random UUID if not provided.
+
+## Usage
+Run multiple instances to simulate a fleet.
+
+```bash
+dotnet run
+# OR with specific VIN (if logic implemented to read args)
+# dotnet run --vin "VEHICLE_001"
+```