I'm trying to register a context menu that implements the IExplorerCommand interface in C++.

I used the example from Microsoft as a basis:

.cpp

I understand the implementation of the IExplorerCommand interface in general. But I don't understand what exactly needs to be done so that the menu itself appears in the context menu?

This repository also contains instructions for building this project, but it uses an application written in C#, and I don't know this language. I'm talking about this repository:

I need a minimal example that would use C++ to register a context menu. I would also be glad if someone at least explains the theoretical part of this process.