added a 1st pass at a contributing doc
updates to document based upon team feedback. V2, baby
added bullets
added link to who is using asgard
updated per Tomas request
Merge branch 'contributing-doc' of github.com:aglover/asgard into contributing-doc
fixed a typo
Merge pull request #463 from aglover/contributing-doc

added a 1st pass at a contributing doc