New additions to the definition list, more newbie friendly descriptions, and added contribs to billboard

Hi everyone.

This is my first time using GitHub, so if I'm messing up, let me know :)

The changes I've done are an expanded definition list, with common kitchen ingredients, more newbie friendly descriptions in the script, and I added a list of contributors, basing it from a list of the forks on this project. I also added the nuclear option to the script, because from several different installs, it seems necessary to be used during the setup.

Thanks!