uwp criar, ler e gravar arquivos locais

https://msdn.microsoft.com/en-us/library/windows/apps/mt185401.aspx

https://msdn.microsoft.com/pt-br/library/windows/apps/mt188752.aspx

http://blog.jerrynixon.com/2012/06/windows-8-how-to-read-files-in-winrt.html

pivot headers

https://blog.hompus.nl/2015/09/04/responsive-pivot-headers-in-universal-windows-platform-apps/