Merge pull request #5523 from neolit123/1.21-add-sig-cl-contributing

sig-cluster-lifecycle: add CONTRIBUTING.md

Author: k8s-ci-robot

sig-cluster-lifecycle/CONTRIBUTING.md

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+# Contributing
+
+Welcome to the Kubernetes SIG Cluster Lifecycle contributing guide. We are excited
+about the prospect of you joining our [community](https://git.k8s.io/community/sig-cluster-lifecycle/)!
+
+## Before You Begin
+
+We strongly recommend you to understand the main
+[Kubernetes Contributor Guide](http://git.k8s.io/community/contributors/guide)
+and adhere to the contribution rules (specially signing the CLA).
+
+You can also check the [Contributor Cheat Sheet](/contributors/guide/contributor-cheatsheet/),
+with common resources for existing developers.
+
+Please be aware that all contributions to Kubernetes projects require time and commitment
+from project maintainers to direct and review work. This is done in additional to many other
+maintainer responsibilities, and direct engagement from maintainers is a finite resource.
+
+## SIG Cluster Lifecycle explained
+
+Read the SIG mission outlined in the SIG [charter][https://git.k8s.io/community/sig-cluster-lifecycle/charter.md].
+
+Video resources:
+- [SIG introduction at KubeCon NA 2020](https://www.youtube.com/watch?v=qi-X-Wszetc)
+  - [Slides](https://docs.google.com/presentation/d/18I1YvBUegWegc7oBJiLLxwA2I1c9VVjH)
+- [SIG contributor onboarding](https://www.youtube.com/watch?v=Bof9aveB3rA)
+
+## Get in touch with the SIG
+
+Find the SIG contact details in its [community page](http://git.k8s.io/community/sig-cluster-lifecycle/README.md#contact):
+- Join the SIG [mailing list](https://groups.google.com/forum/#!forum/kubernetes-sig-cluster-lifecycle)
+- Join the SIG [slack channel](https://kubernetes.slack.com/messages/sig-cluster-lifecycle)
+- Join the periodic SIG [video call](http://git.k8s.io/community/sig-cluster-lifecycle/README.md#meetings)
+
+Using the SIG mailing list or video call is preferred for wider discussion topics that affect
+multiple subprojects. The main SIG slack channel should only be used for SIG level updates
+and more urgent matters.
+
+Note that individual subprojects have their own slack channels and video calls (see bellow).
+
+## Picking a subproject to contribute to
+
+Some subprojects like kubeadm and etcdadm are lower in the stack (operate on the host machine),
+while other subprojects like Cluster API and kops are higher in the stack and also manage
+host machine provisioning and cloud provider setup. A good starting point for contributions
+can be a project that you have used already or have plans using in the future.
+
+See the [list of subprojects](https://git.k8s.io/community/sig-cluster-lifecycle/README.md#subprojects)
+the SIG maintains and pick a project you wish to work on.
+
+Note that individual subprojects follow different process in terms of:
+- Release cycle
+- Issue triage
+- Implementing features
+- Change submissions
+- Meeting format
+
+Join the subproject video call and slack channel and introduce your self.
+
+Navigate to the subproject repository:
+- Read their `README.md` file to understand what the project is about
+- Read their `CONTRIBUTING.md` file if you wish to contribute
+- See who the maintainers of the project are in the `OWNERS` file
+- Find issues labeled with `good-first-issue` and `help-wanted`
+- If you wish to work on an issue, `@` mention the issue author and `/assign @your-self`
+- Once you have started the work, label the issue with `/lifecycle active`
+- Coordinate with the subproject maintainers the submission of changes
+- Provide updates on your work in the subproject video call / slack channel