If the folder contains several files that are visible in Visual Studio (or can be added to project to become visible), then select all of the files in Solution Explorer (using mouse clicks and <Shift> or <Ctrl> keys), then go to Properties, and set the "Copy to Output Directory" to "Copy if newer". The folder and files will be automatically copied.
Or, go to Properties of a project, find options related to Post-build event (which depend on type and language of your project), and define a command like xcopy/I/E "source path" "destination path". In simplest case you can specify the full paths of the folders.