I agree with Sam and the others that we need one, even more so, now that we will have an organization that manages this community. A short, clear and positive one (what is welcomed, not what is banned), like the ones suggested, would work. It would help deal swiftly and fairly with any instances of abuse, for which social media is a perfect space, as we can point to the CC and not have to argue about that particular instance and after somebody has been deeply hurt within our community. It’s not about trolls, but about some people not understanding certain cultural sensitivities. It’s better to be proactive than reactive.
Seeing the CC I would not interpret it as reflecting poorly on our community, on the contrary, I would think: we are open, but only to a civilized communication and common work.