sig-node: add doc with basic info for pause image updates

contributors/devel/sig-node/updating-pause-images.md

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+# Updating Pause Image References
+
+The Kubernetes `pause` image is used to run a 'parent' container for all
+the other containers inside your pod. This image is referenced across many
+projects within the Kubernetes ecosystem, and it's important that we keep them
+all up to date to ensure stable platform support and to avoid confusing things
+for end users.
+
+However, we do need to update those images in a somewhat staggered way across
+the ecosystem, rather than doing it all at once.
+
+### Useful Links
+
+- [Pause Image Changelog][pause-cl]
+- [What is the role of 'pause' container?](https://groups.google.com/g/kubernetes-users/c/jVjv0QK4b_o)
+- [The Almighty Pause Container](https://www.ianlewis.org/en/almighty-pause-container)
+
+### Coordinating updates
+
+When a new `pause` image is released, we generally try to update it in the
+following order, this is to try and ensure that repositories stay in sync, while
+keeping changes well tested and developers unblocked.
+
+#### First level (core projects)
+
+- [kubernetes/kubernetes][k-k-repo]
+- [kubernetes/test-infra][k-infra-repo]
+
+#### Second level (kubernetes-sigs)
+
+- [kubernetes-sigs/image-builder][ks-image-builder]
+- [kubernetes-sigs/kind][ks-kind]
+
+#### Third level (runtimes)
+
+- [cri-o/cri-o][crio]
+- [containerd/containerd][containerd]
+
+#### Fourth level (other projects)
+
+- [kubernetes/minikube][k-minikube]
+
+[k-k-repo]: https://github.com/kubernetes/kubernetes
+[k-infra-repo]: https://github.com/kubernetes/test-infra
+[ks-kind]: https://github.com/kubernetes-sigs/kind
+[crio]: https://github.com/cri-o/cri-o
+[containerd]: https://github.com/containerd/containerd
+[k-minikube]: https://github.com/kubernetes/minikube
+[pause-cl]: https://github.com/kubernetes/kubernetes/blob/master/build/pause/CHANGELOG.md