Add Android support

[nCastle1]

This project was designed to support multiple platforms, but we currently only have an iOS implementation.

There's a previous start at implementing an Android UI in a branch: https://github.com/Esri/indoor-routing-xamarin/tree/zwaap/xamarin_android_version

[sruthibandi0110]

The URL returns 404, Can you share the android implementation sample URL.

[esreli]

@sruthibandi0110

We made the decision to dismiss this branch. Unfortunately the work contained did not meet the standards we require for public release.