implemented map view with markers for every floodstation

lib/services/flood_station_provider.dart

@@ -1,7 +1,10 @@
 import 'package:flutter/material.dart';
 import 'package:async/async.dart';
+import 'package:flutter_map/flutter_map.dart';
+import 'package:latlong2/latlong.dart';
 
 import '../model/flood_station.dart';
+import '../widgets/custom_marker.dart';
 import 'api.dart';
 
 class FloodStationProvider extends ChangeNotifier {
@@ -13,6 +16,17 @@ class FloodStationProvider extends ChangeNotifier {
 
   List<FloodStation> get allStations => _allStations;
   List<FloodStation> get filteredStations => _filteredStations;
+  List<Marker> get stationsAsMarkers {
+    return allStations
+        .map<Marker>(
+          (e) => Marker(
+            alignment: Alignment.center,
+            point: LatLng(e.lat, e.long),
+            child: CustomMarker(),
+          ),
+        )
+        .toList();
+  }
 
   CancelableOperation? _filteredStationsFuture;