How to add another EDK2 module to VisualUefi

[crimsonskylark]

1. Open the solution with Visual Studio;
2. Create a new project for the module in question. In my case, this was "DnsDxe" - part of "NetworkPkg";
3. Change the project from Application (.exe) to Static library (.lib)
4. Add all the relevant C files to the project;
5. Fix the include path