Merge pull request #6516 from marseel/contributing_md

Add CONTRIBUTING for sig-scalability

Author: k8s-ci-robot

sig-scalability/CONTRIBUTING.md

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+# Contributing to SIG Scalability
+
+Welcome to contributing guide to SIG Scalability.
+We are thrilled to have you here.
+
+## Before you begin
+
+Before you begin, please check out [Kubernetes Contributor Guide](http://git.k8s.io/community/contributors/guide) and [Contributor Cheat Sheet](https://github.com/kubernetes/community/blob/master/contributors/guide/contributor-cheatsheet)
+
+## What SIG Scalability works on
+
+SIG Scalability has a few areas that you can contribute to.
+You can find list of [subprojects](https://github.com/kubernetes/community/blob/master/sig-scalability/README.md#details-about-sig-scalability-sub-projects) that we are working on.
+Some of subprojects like `Kubernetes scalability bottlenecks detection` require both very deep and wide understanding of Kubernetes before making reasonable contributions.
+We recommend starting with contributions to `Scalability Test Frameworks` and `Scalability and Performance tests`.
+The easiest way to start contributing is to check issues with `good-first-issue` label [here][good-first-issues] or find issue with `help-wanted` label [here][help-wanted].
+Also, please check out documentation of [Clusterloader2], our [SLOs] and current [Scalability limits].
+If you are unsure in what area you want or should contribute, reach out to one of our [leads] on Slack.
+
+## Get in touch with SIG Scalability members
+
+- Join our Slack channel: [#sig-scalability](https://kubernetes.slack.com/messages/sig-scalability)
+- Reach out to our [leads] directly on Slack
+- Mailing list: [mailing list](https://groups.google.com/forum/#!forum/kubernetes-sig-scale)
+- Join our regular SIG Scalability meeting [calendar](https://calendar.google.com/calendar/embed?src=90g85fajsmubf5vp02uhpbvcq8%40group.calendar.google.com) for upcoming meeting dates.
+
+
+[leads]: https://github.com/kubernetes/community/blob/master/sig-scalability/README.md#leadership
+[good-first-issues]: https://github.com/kubernetes/perf-tests/issues?q=is%3Aissue+is%3Aopen+label%3A%22good+first+issue%22
+[help-wanted]: https://github.com/kubernetes/perf-tests/issues?q=is%3Aissue+is%3Aopen+label%3A%22help+wanted%22
+[Clusterloader2]: https://github.com/kubernetes/perf-tests/blob/master/clusterloader2/README.md
+[SLOs]: https://github.com/kubernetes/community/tree/master/sig-scalability/slos
+[Scalability limits]: https://github.com/kubernetes/community/tree/master/sig-scalability/configs-and-limits