updated service & client app registration steps
updated service & client app registration steps

Azure-Samples/active-directory-dotnet-windows-store,Azure-Samples/active-directory-dotnet-windows-store,Azure-Samples/active-directory-dotnet-windows-store,AzureADSamples/NativeClient-WindowsStore,AzureADSamples/NativeClient-WindowsStore,AzureADSamples/NativeClient-WindowsStore