Created vi-VN directory for Vietnam Code Club
Translate first sentence in Felix and Herbert

Just a very short translation, intended as a tutorial for @andytgeezer.
Approve Hana's translation on Ghostbusters.md
Felix and Herbert (in progress)

I only finished the first part, will continue later.
Felix&Herbert _ finished

Finished it, pls help me to check the translation.
Approve Huyen's translation on Firework.md