You can NOT simply download and run this project:
You must setup a new Google API Project and register for Awareness, Google Places, & Nearby Messages. Register your keystore and updated the AndroidManifest.xml
See: https://developers.google.com/awareness/android-api/get-a-key
See the blog for more info: https://blog.xamarin.com/google-awareness-api-for-android-query-and-react-to-signals/