Add initial gvisor contrib doc

site/content/en/docs/Contributing/gvisor.md

@@ -0,0 +1,33 @@
+---
+linkTitle: "gvisor"
+title: "Releasing a gvisor image"
+date: 2019-09-25
+weight: 10
+---
+
+## Prerequisites
+
+* Credentials for `gcr.io/k8s-minikube`
+* Docker
+* Gcloud
+
+## Background
+
+gvisor support within minikube requires a special Docker image to be generated. After merging changes to `cmd/gvisor` or `pkg/gvisor`, this image will need to be updated.
+
+The image is located at `gcr.io/k8s-minikube/gvisor-addon`
+
+## Why is this image required?
+
+`gvisor` requires changes to the guest VM in order to function. The `addons` feature in minikube does not normally allow for this, so to workaround it, a custom docker image is launched, containing a binary that makes the changes.
+
+## What does the image do?
+
+- Creates log directories
+- Downloads and installs the latest stable `gvisor-containerd-shim` release
+- Updates the containerd configuration
+- Restarts containerd and rpc-statd
+
+## Updating the gvisor image
+
+`make push-gvisor-addon-image`