Fill out definitions document

[linnalihe]

Link to the definition document on google drive:
https://docs.google.com/document/d/1ROibTKOBcMaCw53zZloVLbhXrMG0lJjW6OKUhJaS2hw/edit#

This document will be used as a glossary for terms relevant to clean slate.

[knod]

I'm not sure this document is finished, @seraph776 . Do you feel differently? Otherwise, if you no longer want to be assigned to this issue, you can remove yourself from it as opposed to closing it.

[seraph776]

My apologies. I did not mean to close this!