Find best way to fit coding convention notes into wiki

The HACKING file is awesome, but it would probably be good to add the coding convention issues to the wiki as well.  It may be easier for new volunteers to find.  I recommend adding a link to the wiki entry to the HACKING file, and adding a link from the HACKING file to the wiki.

I will seek feedback on tor-dev as to the best way to include a link to this page from our other documentation and the front page of the wiki

Also, I categorized this ticket as Company because I think it will help maintain our institutional memory, and I couldn't find another component that seemed to fit better.  If someone has a better way to categorize this please feel free to change the ticket.