Function UserLocationMarker

UserLocationMarker(props: UserLocationMarkerProps): null
Displays the user's current location on the map. When used without props, it automatically displays the current location from the device.

Note: You must request location permissions before the marker will display. The useLocation hook does not request permissions automatically.
Parameters
- props: UserLocationMarkerProps
Returns null
Example
```
// Automatic location from device
<MapView map={mapLoadResult.map}>
  <UserLocationMarker tintColor="blue" />
</MapView>

// Manual location
<MapView map={mapLoadResult.map}>
  <UserLocationMarker
    location={{ latitude: 52.8952, longitude: -1.8431 }}
    tintColor="#FF6B35"
  />
</MapView>
```