Add Code of Conduct

Fixes #1321

First try - content for Code of Conduct 
Ok. No problem. I'll leave it as is for flow.

Appreciate the input. Just wasn't sure originally how to be attributing
people.

On Sun, Oct 19, 2014 at 1:48 PM, Pearl Chen <notifications@github.com>
wrote:

> In code-of-conduct.md:
>
> > +
> > +To submit an issue, simply click the Issues tab in the far right menu, below the <> Code tab.
> > +
> > +On the far right of that screen is a big green button that says "New Issue". Click the button and it will take you to a screen like this:
> > +
> > +Please make the Title of your issue Code of Conduct Content Update
> > +
> > +Issues will be reviewed by the Yeoman core team. This is standard for the GitHub workflow, which works primarily to serve code reviews. Any delay in time between your request and its addition to the Code of Conduct is not an indication it has been received negatively.
> > +
> > +Please note that some edits may be made to your suggestion, and this is also standard for the open source community and GitHub workflows.
> > +
> > +We welcome your thoughts and contributions.
> > +
> > +## Consequences for violations to this Code of Conduct
> > +
> > +If a participant engages in any behaviour violating this code of conduct, the core members of this community may take any action they deem appropriate, including warning the offender or expulsion from the community, exclusion from any interaction and loss of all rights in this community.
>
> Your previous version was fine for this paragraph. I was more commenting
> on the random "shout out to Angular team" insertions. So feel free to use
> whichever version you like for this paragraph.
>
> —
> Reply to this email directly or view it on GitHub
> <https://github.com/yeoman/yeoman/pull/1422/files#r19061917>.
>