Feature request - add EBG files to Visual Studio project automatically

[MrCliffster]

Request: the ability to have spkl add its generated files to a specificed VS Project once it has generated them would be fantastic. I've seen this implemented previously with a powershell script, so I'm sure spkl could accomplish the same thing.
Rationale: every time I generate EBG, I always get confused when I try and build once and the solution fails as there are missing files (either new entities or optionsets, usually!). Yes, you only need to add them once, but it's a little bit of work that can be saved by some easy automation.

Thanks Scott! As always - love your work.