Add a Code of Conduct
Add a Code of Conduct

I think given some of setting up of the project, it should lead by
example, and "ship" with a CoC. I have in mind particularly the
sentence:

> Many people use and produce bits of free knowledge but any serious
> attempt quickly runs into tremendous barriers, in every field.
> Participants receive unequal welcome due to gender, language,
> cultural or economic differences.

Using a pull request in case anyone wishes to cheer or object.

costoffreedom/costoffreedom.cc,costoffreedom/costoffreedom.cc