added help massage when selecting stops from map

app/src/main/java/com/rthoni/stssaguenay/ui/fragments/StopMapPickerFragment.java

         _map.getUiSettings().setMyLocationButtonEnabled(true);
         _map.getUiSettings().setCompassEnabled(true);
         _map.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(48.3786565, -71.3354953), 9));
+        _map.setOnMarkerClickListener(new GoogleMap.OnMarkerClickListener() {
+            @Override
+            public boolean onMarkerClick(Marker marker) {
+                Toast.makeText(getContext(), R.string.stop_add_map_help, Toast.LENGTH_LONG).show();
+                return false;
+            }
+        });
         _map.setOnInfoWindowClickListener(new GoogleMap.OnInfoWindowClickListener() {
             @Override
             public void onInfoWindowClick(Marker marker) {

app/src/main/res/values/strings.xml

     <string name="stop_add">Add a favourite stop</string>
     <string name="stop_add_map">Select from map</string>
     <string name="stop_add_list">Select from list</string>
+    <string name="stop_add_map_help">Click on the stop name to select it</string>
 
     <string name="loading">Loading&#8230;</string>
     <string name="loading_schedules">Loading schedules&#8230;</string>