Add wordlist to the styleguide

Related to the glossary, and maybe as a subset of it, we discussed the idea of having a wordlist for the Tor Project on the Styleguide.

This list would have rules for writing, and thus translating Tor related terms.

It will help to save time with discussions related to terms, and to have consistency across our project. It may help to understand the terms, but is not like the glossary the Community team compiled.