Add contributing document (#488)samruddhikhandale/update-contributing

* Create CONTRIBUTING.md

* Direct questions to slack channel

Co-authored-by: Brigit Murtaugh <brigit.murtaugh@microsoft.com>

* Use "dev containers" and "Features"

Apparently devcontainers is two words, and apparently features is a proper noun? I guess 🤷‍♂️

* Prettier formatting

I used https://prettier.io/playground/ since I was editing in the GitHub web editor

* Clarify to "only accept improvements and bug fixes"

Co-authored-by: Samruddhi Khandale <samruddhikhandale@github.com>

* Be more explicit about custom features

Co-authored-by: Samruddhi Khandale <samruddhikhandale@github.com>

* Add link to CLI test docs

* Add semver step in guide

* More specificity in link text

https://github.com/devcontainers/features/pull/488#discussion_r1137819187

* Add CONTRIBUTING.md link in readme

---------

Co-authored-by: Brigit Murtaugh <brigit.murtaugh@microsoft.com>
Co-authored-by: Samruddhi Khandale <samruddhikhandale@github.com>

2 files changed, 64 insertions, 0 deletions

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 100644
index 0000000..f6c7e3a
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,60 @@
+**Thanks for taking the time to contribute! ❤️**
+
+All types of contributions are encouraged and valued, no matter if it's a bug
+report 🐛, a feature request 💡, or a Pull Request 🚀.
+
+- **❓ I have a question:** Ask in [our dev container community Slack channel]
+- **🐛 I found a bug:** [Open an Issue]
+- **💡 I have an idea:** [Open an Issue]
+- **💻 I want to code:** See below
+
+If you like the project, but just don't have time to contribute, that's OK too!
+You can also star the project ⭐, rave about it online 💬, or add a link to us
+🔗 in your project's readme.
+
+⚠️ You must never report security 🔒 related issues, vulnerabilities or bugs
+including sensitive information to the issue tracker, or elsewhere in public.
+Instead, please [report them to the Microsoft Security Response Center]. You can
+read more about our security policy in [`SECURITY.md`].
+
+## Contributing code
+
+👨‍💼 This repository is a collection of dev container Features managed by dev
+container spec maintainers. This repository will **only accept improvements and
+bug fixes** for the [current set of maintained Features].
+
+🚀 If you're looking to create a new Feature, then we encourage adding it to a
+separate repository of your control. The [devcontainers/feature-starter]
+repository has more guidance on self authoring Features.
+
+💡 Once you've self authored the Features and if you'd like to share them with
+the community, then we'd recommend [adding it to the index].
+
+👷‍ If you've identified an issue and you want to fix it, here's how you can get
+started:
+
+1. 🔀 Fork the repo
+2. 💻 Open the repo in your editor
+3. 👨‍💻 Add your changes to your workspace
+4. ✨ [Test your changes using `devcontainer features test`] to make sure
+   everything still works
+5. 🆚 Bump the version of the feature you changed according to [semver]
+6. 🔖 Commit & push your changes
+7. 🔁 Open a PR to get your changes merged
+8. 🚀 Profit!
+
+👩‍⚖️ When contributing code to this project, you may be asked to agree to our
+[Contributor License Agreement].
+
+<!-- prettier-ignore-start -->
+[our dev container community Slack channel]: https://aka.ms/devcontainer_community
+[open an issue]: https://github.com/devcontainers/features/issues/new
+[current set of maintained Features]: https://github.com/devcontainers/features/tree/main/src
+[devcontainers/feature-starter]: https://github.com/devcontainers/feature-starter#readme
+[adding it to the index]: https://github.com/devcontainers/feature-starter#adding-features-to-the-index
+[report them to the Microsoft Security Response Center]: https://msrc.microsoft.com/create-report
+[`SECURITY.md`]: https://github.com/devcontainers/spec/blob/main/SECURITY.md
+[contributor license agreement]: https://opensource.microsoft.com/cla/
+[Test your changes using `devcontainer features test`]: https://github.com/devcontainers/cli/blob/main/docs/features/test.md
+[semver]: https://semver.org/
+<!-- prettier-ignore-end -->
diff --git a/README.md b/README.md
index b887c00..bfe35ba 100644
--- a/README.md
+++ b/README.md
@@ -109,3 +109,7 @@ We are eager to hear your feedback on self-authoring!  Please provide comments a
 
 This repository will accept improvement and bug fix contributions related to the
 [current set of maintained Features](./src).
+
+🤝 You can read more about how to contribute in [`CONTRIBUTING.md`]. ❤️
+
+[`CONTRIBUTING.md`]: CONTRIBUTING.md