Added code of conduct (#2832)
Added code of conduct (#2832)

Added code of conduct, resolves #2135 [ci skip]
igwejk/mocha,adamgruber/mocha,boneskull/mocha,JohnnyEstilles/mocha,JohnnyEstilles/mocha,mochajs/mocha,igwejk/mocha,hoverduck/mocha,mochajs/mocha,JohnnyEstilles/mocha,outsideris/mocha,hoverduck/mocha,boneskull/mocha,adamgruber/mocha,hoverduck/mocha,adamgruber/mocha,outsideris/mocha,mochajs/mocha,boneskull/mocha,hoverduck/mocha