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README.md

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+# OTA Fleet Management - Backend API
+
+This project hosts the ASP.NET Core Web API for the OTA Fleet Management System. It handles vehicle registration, group management, firmware uploads, and deployment orchestration.
+
+## Tech Stack
+*   **.NET 9 / ASP.NET Core**: High-performance web framework.
+*   **Entity Framework Core**: ORM for data access.
+*   **SQLite**: Lightweight database (configured for In-Memory for tests/demo, file-based for persistence).
+
+## Key Features
+*   **Vehicle Management**: Register vehicles, heartbeat tracking.
+*   **Group Management**: Organize vehicles into logical groups (e.g., "Beta", "Production").
+*   **Firmware Repository**: Upload and version firmware files.
+*   **Deployment Logic**: Assign updates to specific vehicles or entire groups.
+*   **Object Cycle Handling**: Configured to handle bidirectional relationships in JSON serialization.
+
+## Getting Started
+
+1.  **Run the API**:
+    ```bash
+    dotnet run
+    ```
+    The API listens on `http://localhost:5000` (HTTP) and `https://localhost:5001` (HTTPS) by default.
+
+2.  **API Documentation**:
+    Navigate to `http://localhost:5000/swagger` to view the Swagger UI and test endpoints.
+
+## Project Structure
+*   `Endpoints/`: Minimal API endpoint definitions.
+*   `Data/`: EF Core DbContext and Entities.
+*   `Properties/launchSettings.json`: Configuration for local development ports.