feat(example): add multiple component examples app

[LRNZ09]

Overview

Add an example app showing different ways to use the MaskedView component in Android and iOS. The example app project has been created with react-native-test-app.

Test Plan

1. Enter the example folder
2. Run yarn to install the dependencies
3. If you want to run the project on iOS, run pod install --project-directory=ios and then yarn ios
4. If you want to run the project on Android, just run yarn android
5. You should be able to select among three different examples

[Naturalclar]

Fixes #172