To create an app with a Map you need to embed HTML line of code shared by Google Maps.
To get this HTML code follow these simple steps:
1. Go to Google Maps
2. Search Google Maps or place a pin to get a location
3. Click 'Share' button
4. Click 'Embed a map' tab in opened window
5. Click 'COPY HTML' button to copy line of HTML code
6. Insert code into 'Map Embed Html' field