Add CONTRIBUTING

Author: js-choi

CONTRIBUTING.md

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+# Contributing to this proposal
+First off, thank you for taking the time to contribute! 🎉
+
+Here are some suggestions to contributing to this proposal.
+
+1. The general [TC39 Process][], which summarizes
+   how TC39’s “consensus” and “Stages” work.
+2. The guide on [contributing to TC39 proposals][contributing guide].
+3. The [TC39 Code of Conduct][CoC]:
+   It has important information about how we’re all expected to act
+   and what to do when we feel like someone’s conduct does not meet the Code.
+   We all want to maintain a friendly, productive working environment!
+4. The [TC39 How to Give Feedback][feedback] article.
+5. The [proposal explainer][] to make sure that it is
+   not already addressed there.
+6. The [TC39 Matrix guide][] (if you want to chat with TC39 members on Matrix,
+   which is a real-time chat platform).
+7. If the explainer does not already explain your topic adequately,
+   then please [search the GitHub repository’s issues][issues]
+   to see if any issues match the topic you had in mind.
+   This proposal is more than four years old,
+   and it is likely that the topic has already been raised and thoroughly discussed.
+
+You can leave a comment on an [existing GitHub issue][issues],
+create a new issue (but do try to [find an existing GitHub issue][issues] first),
+or [participate on Matrix][TC39 Matrix guide].
+
+Please try to keep any existing GitHub issues on their original topic.
+
+If you feel that someone’s conduct is not meeting the [TC39 Code of Conduct][CoC],
+whether in this GitHub repository or in a [TC39 Matrix room][TC39 Matrix guide],
+then please follow the [Code of Conduct][CoC]’s directions for reporting the violation,
+including emailing [[email protected]][].
+
+Thank you again for taking the time to contribute!
+
+[CoC]: https://tc39.es/code-of-conduct/
+[TC39 process]: https://tc39.es/process-document/
+[contributing guide]: https://github.com/tc39/ecma262/blob/master/CONTRIBUTING.md#new-feature-proposals
+[feedback]: https://github.com/tc39/how-we-work/blob/master/feedback.md
+[proposal explainer]: https://github.com/tc39/proposal-array-from-async/blob/main/README.md
+[TC39 Matrix guide]: https://github.com/tc39/how-we-work/blob/master/matrix-guide.md
+[issues]: https://github.com/tc39/proposal-array-from-async/issues?q=is%3Aissue+
+[[email protected]]: mailto:[email protected]