Readme is outdated

[asanducristian]

update the readme with the current version of startPayment. Tried to create a PR but 403 so...

  const netopia = new Netopia({
    apiKey: process.env.NETOPIA_API_KEY,
    sandbox: true,
  });

  const requestData = {
    // Required fields:
    order: {
      amount: "100.00",                 // Payment amount
      currency: "RON",                  // Payment currency (RON, EUR, etc.)
      dateTime: "2024-06-10T12:00:00Z", // Order timestamp
      orderID: "ORDER-123456",          // Unique order identifier
      billing: {
        firstName: "John",              // Customer's first name
        lastName: "Doe",                // Customer's last name
        email: "john.doe@example.com",  // Customer's email address
        phone: "+40721234567",          // Customer's phone number
      }
    }
    products: [                         // array of products
        {                               // it works also by sending an array of empty json objects but don't know if it breaks anything else
            name: 'name',
            code: 'SKU',
            category: 'category',
            price: 1,
            vat: 19,
        },
    ],
  };

  try {
    netopia.setOrderData(requestData.order);
    netopia.setProductsData(requestData.order.products);
    const response = await netopia.startPayment();
    res.status(200).json(response);
  } catch (error) {
    res.status(500).json({ message: error.message });
  }
});