Add V&V case, Mach 5 Shock-Wave Boundary-Layer Interaction by pcarruscag · Pull Request #1651 · su2code/SU2

Although marked as WIP I guess this is safe to approve ;) and of course here as well thanks for this vandv effort 💐 (of course if you plan to add more I'll take another look 👍 )

I really like your cfg "sections" ... very well made (I usually like the little header with author, date, etc. but I also see why that is not really necessary)