how to add a libary's files to Visual Studio
First, download the library's files if you haven't already. Then in your project's solution explorer . . .
right click your project
choose "Add" and "New Filter"
name the filter after the library
right click the filter
choose "Add" and "Existing Item"
find and select the library's .h and .cpp files (hold shift or control to select multiple files)
click "Add"
Done.