Add CONTRIBUTING.md to sig scheduling

sig-scheduling/CONTRIBUTING.md

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+# Contributing to SIG Scheduling
+
+Welcome to contributing to SIG Scheduling. We are excited about the prospect of you
+joining our [community](https://github.com/kubernetes/community/tree/master/sig-scheduling)!
+
+SIG Scheduling is responsible for the components that make Pod placement decisions.
+You can read the SIG mission outlined in the [charter](https://git.k8s.io/community/sig-cluster-lifecycle/charter.md).
+
+There are multiple ways you can participate, including PRs, issues, documentation, new proposals,
+helping to answer end-user's questions, attending meetings. All kinds of contributions are welcomed.
+
+## Before you begin
+
+We strongly recommend you to check out the [Kubernetes Contributor Guide](https://github.com/kubernetes/community/tree/master/contributors/guide)
+and [Contributor Cheat Sheet](https://github.com/kubernetes/community/tree/master/contributors/guide/contributor-cheatsheet) first.
+
+## Getting Started
+
+* If you're a newcomer and have no idea where to start, we have a non-stale pool of issues that are
+available for you:
+  * [first-good-issue](https://github.com/kubernetes/kubernetes/issues?q=is%3Aissue+is%3Aopen+label%3A%22good+first+issue%22+label%3Asig%2Fscheduling+)
+  * [help wanted](https://github.com/kubernetes/kubernetes/issues?q=is%3Aissue+is%3Aopen+label%3A%22help+wanted%22+label%3Asig%2Fscheduling+)
+
+* If you want to know how kube-scheduler generally works, you can read the [scheduling-eviction](https://kubernetes.io/docs/concepts/scheduling-eviction/).
+
+* If you want to understand the architectural details of kube-scheduler, you can refer to the [design docs](https://github.com/kubernetes/community/tree/master/contributors/devel/sig-scheduling)
+  or [KEPs](https://github.com/kubernetes/enhancements/tree/master/keps/sig-scheduling).
+
+* If you have any questions, you can find us in the Kubernetes [slack](https://app.slack.com/client/T09NY5SBT/C09TP78DV).
+
+* If you find a bug, please open an issue under kubernetes/kubernetes with labels `/sig scheduling` and `/kind bug`,
+also follow the requirements of `Bug Report`, it will help us a lot when analyzing the errors.
+
+* If you have a feature request:
+  * Open an issue under kubernetes/kubernetes with labels `/sig scheduling` and `/kind feature`, please focus on
+  the user stories
+  * If there's any debate on the rationalities, you can bring it to the [SIG meeting](https://github.com/kubernetes/community/tree/master/sig-scheduling#meetings).
+  * If there are multiple implementation options, consider creating a doc with Pros and Cons, and gather some feedback.
+  You can do this by sharing the doc with the SIG's [mailing list](https://groups.google.com/forum/#!forum/kubernetes-sig-scheduling).
+  * If necessary, open an issue in kubernetes/enhancements and write a [KEP](https://github.com/kubernetes/enhancements/tree/master/keps/sig-scheduling) for it.
+
+* If you find any out-of-date documentation, please help the community correct that by either sending a PR to
+update the docs or open an issue if you are not sure about how to fix it.
+  * For website documentation, you can open issues at [kubernetes/website](https://github.com/kubernetes/website).
+  * For developer documentation, you can open issues at [kubernetes/community](https://github.com/kubernetes/community).
+
+* We also maintain a list of [sub projects](https://github.com/kubernetes/community/tree/master/sig-scheduling#subprojects) here.
+If you're interested, you can contribute to them as well.
+
+## Best Practices
+
+The community has been following some practices to help ensure maintainable and quality code:
+
+* It is best if a PR is first reviewed by the [Reviewers](https://github.com/kubernetes/community/blob/master/community-membership.md#reviewer). Once the PR gets a `/lgtm` from a Reviewer,
+  [Approvers](https://github.com/kubernetes/community/blob/master/community-membership.md#approver) will review the PR to approve it.
+
+* Leave the Reviewers assigned by the bot automatically if possible, unless there is a need
+for a specific contributor's expertise.
+
+* Critical bug fixes can be assigned to approvers directly.
+
+* Always add a new commit to address review comments instead of amending. This helps to
+review the new changes. You might be asked by the Reviewer to squash at a certain point.
+
+* Squash the commits when the PR is ready to merge, this does a great favor for the git history.
+
+* Code contributions should be relatively small, simple, well documented and well tested.
+Try to split your changes into incremental PRs if the feature is big.
+
+* Whatever discussed offline or at the community meeting should be recorded back
+to the issue/PR, which helps to preserve the context.
+
+* Always open an issue for a TODO or a follow-up just in case you forget it.
+
+## Use of @mentions
+
+* @kubernetes/sig-scheduling-api-reviews - API Changes and Reviews
+* @kubernetes/sig-scheduling-bugs - Bug Triage and Troubleshooting
+* @kubernetes/sig-scheduling-feature-requests - Feature Requests
+* @kubernetes/sig-scheduling-misc - General Discussion from Approvers and Reviewers
+* @kubernetes/sig-scheduling-pr-reviews - PR Reviews
+* @kubernetes/sig-scheduling-proposals - Design Proposals
+* @kubernetes/sig-scheduling-test-failures - Test Failures and Triage