Fix impementation

[aleksandrscanbot]

Hello,
sorry for late response.

Please see fixes for implementation Scanbot BarcodeScanner.

There are 2 fixes:
1.
add line in the TestBlankApp.Android : MainActivity.cs ()

            base.OnCreate(savedInstanceState);

            **ScanbotBarcodeSDK.Forms.Droid.DependencyManager.Register();**

            Xamarin.Essentials.Platform.Init(this, savedInstanceState);

add 2 packages:

    <PackageReference Include="Xamarin.Android.Support.v7.AppCompat">
      <Version>28.0.0.3</Version>
    </PackageReference>
    <PackageReference Include="Xamarin.Android.Support.Constraint.Layout">
      <Version>2.0.0-beta2</Version>
    </PackageReference>

Feel free to ask any help!

Best regards,
Aleksandr