UC 01.01.02 specify start and end on map

[ChinaHuxin]

Partial User Story:
US 01.01.01
As a rider, I want to request rides between two locations.

Rationale:

• Be able to pick a point on the map where the rider wants to be picked up
• Be able to pick a point on the map where the rider wants to be dropped off

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Notes:
Automatically make start and end locations on the rider's current location.
Make a moveable point to pick either or both start and end locations on the map.