Added README information about Verifying Google Play Services installation on your device or emulator.
Fixed README punctuation error.
Fixed Xamarin.Android version references in the README  summary.
Added README information about Specifying additional permissions.
Added README information about Adding the API Key to your application.
Added mock location providers.
Added buttons for triggering location get from device location and mock location providers.
Added event location return listeners for device location and mock location providers.
Added notice dialogs for provider enable, provider disable and provider status change.
Added mock location provider cleanup.