Update readme.md
Update readme.md

AzureADSamples/NativeClient-WindowsPhone8.1,AzureADSamples/NativeClient-WindowsPhone8.1,Azure-Samples/active-directory-dotnet-windowsphone-8.1,Azure-Samples/active-directory-dotnet-windowsphone-8.1,AzureADSamples/NativeClient-WindowsPhone8.1,Azure-Samples/active-directory-dotnet-windowsphone-8.1