Google Maps Swift SDK Tutorial 

- [x] Create Google Maps API key [here](https://developers.google.com/maps/documentation/ios-sdk/get-api-key#add_key)
- [ ] Build Swift app using tutorial code: [tutorial](https://developers.google.com/maps/documentation/ios-sdk/start#None-swift)
- [ ] Modify code to display 2 markers
- [ ] Show driveable path between 2 markers and show distance