On each iteration add marker to map

frontend/src/lib/components/tabs/MapTab.svelte

@@ -38,7 +38,11 @@
             latitude = crd.latitude;
             longitude = crd.longitude;
             accuracy = crd.accuracy;
-            
+			
+    		const userMarker = leaflet.marker([latitude, longitude]).addTo(map);
+			// move the map to have the location in its center
+			map.panTo(userMarker.getLatLng());
+
             string += "Your current position is:";
             string += `Latitude : ${crd.latitude}`;
             string += `Longitude: ${crd.longitude}`;