Updated compilation instructions for Visual Studio 2015.
Updated compilation instructions for Visual Studio 2015.

pvginkel/PdfiumViewer,stevewangamm/PdfiumViewer,pvginkel/PdfiumViewer,stevewangamm/PdfiumViewer,MichalGrzegorzak/PdfiumViewer,ballance/PdfiumViewer,MichalGrzegorzak/PdfiumViewer,ballance/PdfiumViewer