Xamarin Project - Google Firebase Database How To use....???

Question

Hello ...Please Help Me... 

 

Visual Studio 2017 - Xamarin Project Add Nuget Package - Firebase.Xamarin Install Time Below Write Error passing How Solve This Error : 

 

Error Package Firebase.Xamarin 0.3.6 is not compatible with monoandroid81 (MonoAndroid,Version=v8.1). Package Firebase.Xamarin 0.3.6 supports: net (.NETFramework,Version=v0.0)