Updating the README.md following-up a change in the portal
Updating the README.md following-up a change in the portal

Azure-Samples/active-directory-dotnet-native-aspnet5,AzureADSamples/NativeClient-AspNet5,Azure-Samples/active-directory-dotnet-native-aspnet5,AzureADSamples/NativeClient-AspNet5