title: Copying assets into UWP application package
body: <p>I have a large folder structure with a ton of subfolders that I am using for application data in my UWP app. When testing, I can just have it sitting on disk and it's fine, but when I make a store package, I need to be able to copy that data in. The only way I've found to include assets is to manually add individual files into Visual Studio and set them to be "Content". Is there a way to copy in an entire folder as "Content" and preserve its folder structure?</p>