Update README.md

README.md

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 # Angular-ionic-google-map
+user can use this library module by directly importing in angular module.
+
+just import in module.
+import { GoogleMapModule } from './google-map/Google-Map-Module';
+
+use as with selector with your own google map API key
+
+<app-google-map [MapCenter]="latlng" (SelectedLatLng)="getNewLatLong($event)" ApiKey="***************"></app-google-map>
+
+MapCenter is the center co-ordintate of map which user will see.
+Selected LatLng is value which has been emited by map component,, user can get it in event.
+ApiKey privide your Google API key for accesing may.