change to use nuget instruction

Author: sgong-pdftron

README.md

@@ -4,11 +4,7 @@
 
 This sample shows how to use PDFTron for Xamarin in Xamarin.Forms project via `PageRenderer`. You can run this sample on Android, iOS and UWP. It shows a simple `PDFViewCtrl` with annotation functionality as well as a more advanced viewer (iOS and Android only).
 
-To run the Android or iOS project, open the solution in Visual Studio and restore all the NuGet packages.
-
-To run the UWP project, please install the `PDFNetUWPApps.vsix` file inside the `/lib` folder from the download package.
-
-From the UWP download package, copy `/Samples/PDFViewCtrlTools_VS2015` folder to inside `ContentPage` folder. i.e. you will have `/ContentPage/PDFViewCtrlTools_VS2015` folder.
+To run the sample, open the solution in Visual Studio and restore all the NuGet packages.
 
 Note:
 Please update to the latest version of Visual Studio 2019 and/or Visual Studio for Mac.