add a contributing guide with dco requirement - closes #585

Signed-off-by: clux <[email protected]>

Author: clux

CONTRIBUTING.md

@@ -0,0 +1,32 @@
+# Contributing Guide
+
+This document describes the requirements for committing to this repository.
+
+## Developer Certificate of Origin (DCO)
+
+In order to contribute to this project, you must sign each of your commits to
+attest that you have the right to contribute that code. This is done with the
+`-s`/`--signoff` flag on `git commit`. More information about DCO can be found
+[here](https://developercertificate.org/)
+
+## Pull Request Management
+
+All code that is contributed to kube-rs must go through the Pull Request (PR)
+process. To contribute a PR, fork this project, create a new branch, make
+changes on that branch, and then use GitHub to open a pull request with your
+changes.
+
+Every PR must be reviewed by at least one Core Maintainer of the project. Once
+a PR has been marked "Approved" by a Core Maintainer (and no other core
+maintainer has an open "Rejected" vote), the PR may be merged. While it is fine
+for non-maintainers to contribute their own code reviews, those reviews do not
+satisfy the above requirement.
+
+## Code of Conduct
+
+This project has adopted the [CNCF Code of
+Conduct](https://github.com/cncf/foundation/blob/master/code-of-conduct.md).
+
+## Contact
+You can ask general questions / share ideas / query the community at the [kube-rs discussions forum](https://github.com/kube-rs/kube-rs/discussions).
+You can reach the maintainers of this project at [#kube](https://discord.gg/tokio) channel on the Tokio discord.