Is there such a thing as a “content/data only project” in visual studio

Question

I have a bunch of ancillary XML and XSLT files that I want to edit and manage in visual studio.

The files do not logically belong under any code project in my solution

Answer 1

Visual Studio 2015 has a project type called "Shared Project" which is essentially a content only project with no targets. It's listed under Visual C# but it can be used for any files.