Add initial implementation of Map SDK and example app

- Create README for the main repository and example app
- Implement example app with MapView and Marker components
- Add package.json for example app with necessary scripts and dependencies
- Create Map SDK package with TypeScript wrapper around react-native-maps
- Define TypeScript configuration for the SDK

packages/map-sdk/src/index.ts

@@ -0,0 +1,2 @@
+export { default as MapView } from './MapView';
+export { Marker, Polyline, PROVIDER_GOOGLE } from 'react-native-maps';