Add service file and pin for map

mobile/src/screens/Home.js

@@ -6,6 +6,7 @@ import centerImage from './images/center.png'
 import settingsImage from './images/settings.png'
 import searchImage from './images/search.png'
 import cancelImage from './images/cancel.png'
+import pinImage from './images/pin.png'
 
 export class Home extends React.Component {
   static navigatorButtons = {
@@ -88,7 +89,9 @@ export class Home extends React.Component {
                 key={marker.key}
                 coordinate={marker.latlng}
                 title={marker.title}
-                description={marker.location} />
+                description={marker.location}
+                image={pinImage}
+                anchor={{x: 0.5, y: 1.0}} />
             ))
           }
         </MapView>