MPA5.2 and MVSP referentials

[charlesgoyard]

Hi,
I submitting the Motion Picture Association and Minimum Viable Security Product referentials for inclusion into Deming.
I wanted to make a pull request but noticed the storage directory is in .gitignore, so maybe that's not the proper way.

• MPA-5.2-Best-Practices.xlsx
• mvsp-3.0.xlsx
• README.md (short table to describe the files)

Thanks !
Charles

[Didier Barzin]

Thank you for this contribution, you may propose a pull request !