Add docs for PR process. (#6264)

Fixes #5685

Signed-off-by: jberkhahn <jaberkha@us.ibm.com>

Author: jberkhahn

website/content/en/docs/contribution-guidelines/opening-pull-requests.md

@@ -0,0 +1,34 @@
+---
+title: Opening Pull Requests
+weight: 30
+---
+
+Changes to Operator SDK are submitted via [Github Pull Request (PR)][gh-pr]
+to the relevant repository. Most PRs will be to the [main Operator SDK repo][operator-sdk-repo].
+
+## PR Checklist
+1. Add [tests][adding-tests] for your change, and ensure they run and pass in CI.
+1. Add a [changelog entry][changelog-docs] if necessary.
+1. Add relevant [documentation][adding-docs].
+1. Rebase your commits on master and squash them into a single commit.
+1. Write a concise commit message that references the issue number.
+1. Push your commit to your fork and [open a pull request][gh-fork-pr].
+
+
+## Review
+
+Before a pull request can be merged, tests must pass in CI and it must be reviewed. A PR
+must be approved by 2 reviewers, one of which must be at least at least a reviewer and one
+of which must be at least an approver, per the [Operator Framework community guidelines][of-contributor-ladder].
+
+Please feel free to message the developers to get eyes on your PR, whether through @'ing on the PR itself,
+the #operator-sdk-dev channel on Kubernetes slack, or by attending the Operator SDK [triage meeting][triage-meeting].
+
+[adding-docs]:https://sdk.operatorframework.io/docs/contribution-guidelines/documentation/
+[adding-tests]:https://sdk.operatorframework.io/docs/contribution-guidelines/testing/
+[changelog-docs]:https://sdk.operatorframework.io/docs/contribution-guidelines/changelog/#m-docscontribution-guidelineschangelog
+[gh-fork-pr]:https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/creating-a-pull-request-from-a-fork
+[gh-pr]:https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/about-pull-requests
+[of-contributor-ladder]:https://github.com/operator-framework/community/blob/master/contributor-ladder.md
+[operator-sdk-repo]:https://github.com/operator-framework/operator-sdk
+[triage-meeting]:https://github.com/operator-framework/community#operator-sdk-issue-triage