How to add a dummy C++ game module? Thank you.

How to add a dummy C++ game module? Thank you.
Integrating the plugin from source with an existing project. The existing project is Showdown VR Demo. It is a pure Blueprint project.

The current recommended way to integrate the OSVR Unreal plugin with an existing project is directly from source.
NOTE: if your project is a pure Blueprint project, you may need to add a dummy C++ game module to your project to get Unreal to generate a Visual Studio project for you. Otherwise it may complain about there not being any code to compile (having local plugins isn’t enough).

Thank you.

Add any c++ class to your project from inside the editor.

Thank you for your help.