add headers & package name costumization

example/lib/main.dart

@@ -57,6 +57,9 @@ class _MyHomePageState extends State<MyHomePage> {
         ),
         body: MapCameraLocation(
           camera: widget.camera,
+          userAgent: 'OxinosMapCameraFlutter/1.0 (contact: support@oxinos.io)',
+          refererUrl: 'https://oxinos.io',
+          packageName: 'com.oxinos.map_camera_flutter',
           onImageCaptured: (ImageAndLocationData data) {
             print('Captured image path: ${data.imagePath}');
             print('Latitude: ${data.latitude}');