Adding GKE tutorial

docs/Manual/Tutorials/Kubernetes/GKE.md

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+# Start ArangoDB on Google Kubernetes Engine in 5 minutes
+
+In this guide you'll learn how to run ArangoDB on Google Kubernetes Engine (GKE).
+
+## Create a Kubernetes cluster
+
+In order to run ArangoDB on GKE you first need to create a Kubernetes cluster.
+
+To do so, go to the GKE console.
+You'll find a list of existing clusters (initially empty).
+
+![clusters](./gke-clusters.png)
+
+Click on `CREATE CLUSTER`.
+
+In the form that follows, enter information as seen in the screenshot below.
+
+![create a cluser](./gke-create-cluster.png)
+
+We've succesfully ran clusters with 4 `1 vCPU` nodes or 3 `2 vCPU` nodes.
+Smaller node configurations will likely lead to unschedulable `Pods`.
+
+Once you click `Create`, you'll return to the list of clusters and your
+new cluster will be listed there.
+
+![with new cluster](./gke-clusters-added.png)
+
+It will take a few minutes for the cluster to be created.
+
+Once you're cluster is ready, a `Connect` button will appear in the list.
+
+![cluster is ready](./gke-clusters-ready.png)
+
+## Getting access to your Kubernetes cluster
+
+Once your cluster is ready you must get access to it.
+The standard `Connect` button provided by GKE will give you access with only limited
+permissions. Since the Kubernetes operator also requires some cluster wide
+permissions, you need "administrator" permissions.
+
+To get these permissions, do the following.
+
+Prepare your `~/.kube/config` with the following content:
+
+```yaml
+apiVersion: v1
+clusters:
+- cluster:
+    certificate-authority-data:
+    server: https://
+  name: my_cluster
+contexts:
+- context:
+    cluster: my_cluster
+    user: my_cluster
+  name: my_cluster
+current-context: my_cluster
+kind: Config
+preferences: {}
+users:
+- name: my_cluster
+  user:
+    username: admin
+    password:
+```
+
+Click on the `Edit` button (pencil image) next to your cluster.
+This will lead you to the following page.
+
+![edit cluster](./gke-edit-cluster.png)
+
+Copy the `Endpoint` IP address and paste it after `server: https://`.
+
+The click on `Show credentials`.
+The following popup will appear.
+
+![show credentials](./gke-show-credentials.png)
+
+Copy the `Password` and paste it after `password:`.
+
+Close the popup and then return to the cluster list.
+
+Click on `Connect` next to your cluster.
+The following popup will appear.
+
+![connect to cluster](./gke-connect-to-cluster.png)
+
+Click on `Run in Cloud Shell`.
+It will take some time to launch a shell (in your browser).
+
+Once ready, run the `gcloud` command that is already prepare in your commandline.
+
+The run `cat ~/.kube/config` and copy the line that starts with `certificate-authority-data:`.
+Override the corresponding line in your local `~/.kube.config` file.
+
+You should now be able to access your cluster using `kubectl`.
+
+To verify try a command like:
+
+```bash
+kubectl get pods --all-namespaces
+```
+
+## Installing `kube-arangodb`
+
+You can now install the ArangoDB Kubernetes operator in your Kubernetes cluster
+on GKE.
+
+To do so, follow the [Installing kube-arangodb](./README.md#installing-kube-arangodb) instructions.
+
+## Deploying your first ArangoDB database
+
+Once the ArangoDB Kubernetes operator has been installed and its `Pods` are in the `Ready`
+state, you can launch your first ArangoDB deployment in your Kubernetes cluster
+on GKE.
+
+To do so, follow the [Deploying your first ArangoDB database](./README.md#deploying-your-first-arangodb-database) instructions.
+
+Note that GKE supports `Services` of type `LoadBalancer`.