Merge pull request #6555 from Riaankl/create_CONTRIBUTING.md

Create CONTRIBUTING.md

Author: k8s-ci-robot

sig-architecture/CONTRIBUTING.md

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+# Contributing to SIG Architecture
+The best place to find information and resources to be able to participate and support SIG Architecture's work is to visit the  Architecture Special Interest Group [Github repo](https://github.com/kubernetes/community/tree/master/sig-architecture) and the  [README](https://github.com/kubernetes/community/tree/master/sig-architecture) file.
+You can also learn more about the [SIG Architecture Charter](https://github.com/kubernetes/community/blob/master/sig-architecture/charter.md) following the link.
+
+## Getting started
+Joining the [mailing list](https://groups.google.com/forum/#!forum/kubernetes-sig-architecture) will get you invited to our meetings.
+
+Our Regular SIG Meeting is Thursdays at 11:00 PT (Pacific Time) (biweekly). This would be a good place to start.
+
+There are also various [Working groups](https://github.com/kubernetes/community/tree/master/sig-architecture#working-groups) and [Subprojects](https://github.com/kubernetes/community/tree/master/sig-architecture#subprojects) meetings where new contributors are always welcome.
+
+Contributions are made via Pull requests.  Before opening a pull request, contributors must sign the [CNCF Contributor License Agreement](https://github.com/kubernetes/community/blob/master/CLA.md)
+
+
+## Questions about contributing
+Feel free to ask any questions in the [#sig-architecture](https://kubernetes.slack.com/archives/C5P3FE08M) 
+Slack channel through the Kubernetes Slack. To get a Slack invite, visit http://slack.k8s.io/ . Once you're logged you can join the channel. Alternatively, you could join any one of our meetings.