Add create-admin script to package.json and set up /api/users route in server.js for user management functionality.

README.md

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+# Car Tuning CRM System
+
+A modern CRM system for car tuning businesses, built with React and Node.js.
+
+## Features
+
+- User authentication and authorization
+- Customer management
+- Contact history tracking
+- Car modification details
+- Modern, responsive UI
+- Search and filter capabilities
+
+## Prerequisites
+
+- Node.js (v14 or higher)
+- MongoDB
+- npm or yarn
+
+## Installation
+
+1. Clone the repository:
+```bash
+git clone <repository-url>
+cd car-tuning-crm
+```
+
+2. Install backend dependencies:
+```bash
+npm install
+```
+
+3. Install frontend dependencies:
+```bash
+cd client
+npm install
+```
+
+4. Create a `.env` file in the root directory with the following variables:
+```
+MONGODB_URI=mongodb://localhost:27017/car-tuning-crm
+JWT_SECRET=your-secret-key
+PORT=5000
+```
+
+## Running the Application
+
+1. Start the backend server:
+```bash
+npm run dev
+```
+
+2. In a new terminal, start the frontend development server:
+```bash
+cd client
+npm start
+```
+
+The application will be available at:
+- Frontend: http://localhost:3000
+- Backend API: http://localhost:5000
+
+## API Endpoints
+
+### Authentication
+- POST /api/auth/login - User login
+- POST /api/auth/register - Register new user (admin only)
+
+### Customers
+- GET /api/customers - Get all customers
+- GET /api/customers/:id - Get single customer
+- POST /api/customers - Create new customer
+- PUT /api/customers/:id - Update customer
+- DELETE /api/customers/:id - Delete customer
+
+### Contacts
+- GET /api/contacts/customer/:customerId - Get all contacts for a customer
+- POST /api/contacts - Create new contact
+- PUT /api/contacts/:id - Update contact
+- DELETE /api/contacts/:id - Delete contact
+
+## Security
+
+- All routes except login are protected with JWT authentication
+- Passwords are hashed using bcrypt
+- CORS is enabled for the frontend domain
+
+## Contributing
+
+1. Fork the repository
+2. Create your feature branch
+3. Commit your changes
+4. Push to the branch
+5. Create a new Pull Request