Adding the Rust Code of Conduct

[davidalber]

It seems like a good idea to add the Rust Code of Conduct here. What do you think? It's in the core Rust repository (here). This PR adds it to rustfmt. I kind of think, for history's sake, that it would make sense for the repository owners' to add it, so if you want to do that, that's fine by me!

I followed the lead in the Rust repository to add the full Code of Conduct, rather than just linking to the page from rust-www. I think that's a nicer solution, but it does come with a risk of the Code of Conduct in satellite repositories becoming out of sync with the main version. To help with that, I've set up a repository that verifies everything is in sync (here).

Adding something will turn the Code of conduct line from the Community Page into a green checkmark.

[davidalber]

Also, I think really there should be a policy created for what is done with all of the Rust repositories, rather than doing a one-off change. I'm not sure how best to pursue that, though. Maybe reach out to the Community or Moderation Teams?

[nrc]

Hey, thanks for the PR! Agree it's a good thing to do, and having the CoC inline rather than a reference is probably good if only to satisfy GitHub. The checking repo looks really useful too, since getting out of sync is of course the worry. I discussed this a little with the core team and yeah, a policy is probably a good thing to have. It would be up to the community team so you should ping someone there, perhaps Ashley.

For this PR, could you add a link to the CoC from the README please?

[davidalber]

I added links to the README, as requested. I also noticed that the Rust repository links to the Code of Conduct from its contributing page and did something similar.

Live examples:

• Code of Conduct

• Link in README
  

• Link in Contributing.md
  

[nrc]

Perfect, thanks!