Helper script for ScummVM in RetroArch

[ArturoGurrola]

I recently added a bunch of ScummVM games to my collection.

Since I like to use RetroArch for everything I can, I created a small script to help me on this task. (I first used EpicFail's tool but I didn't like the result).

You can get the script here: https://github.com/ManuelGurrola/LB_scummvm/

Instructions are in the GitHub's README.md.