Allow user to add marker to map

[haypho]

Helpful Links

• https://github.com/alizahid/location-picker-demo/blob/master/App.js

Acceptance Criteria

• Given a user when on the map screen then there should be a FAB for adding a new marker via the new marker flow
• Given a user when long pressing on the map screen then the map screen will start the new marker flow
• Given a user when adding a new marker then the map should move around a centered marker
• Given the user when adding a new marker then there should be a confirmation button for the marker location
• Given the user when adding a new marker then there should be a cancel button for the marker flow
• Given the user when confirming the marker location then the marker flow should show in a new screen