In Visual Studio 2017, open the Part3 solution, and choose File | Add | New Project....
In the Add New Project dialog, in the Installed list, select Visual C# | Windows Universal. In the center list, select Blank App (Universal Windows), type the name as FluentUwpApp, and then click on OK.
In the New Universal Windows Platform Project dialog, choose the latest version of Windows 10 for Target Version and Minimum Version, and click on OK, as shown in the following screenshot: