doctl-kubernetes-cluster: add page (#8846)

pages/common/doctl-kubernetes-cluster.md

@@ -0,0 +1,28 @@
+# doctl kubernetes cluster
+
+> Manage Kubernetes clusters and view configuration options relating to clusters.
+> More information: <https://docs.digitalocean.com/reference/doctl/reference/kubernetes/cluster/>.
+
+- Create a Kubernetes cluster:
+
+`doctl kubernetes cluster create --count {{3}} --region {{nyc1}} --size {{s-1vcpu-2gb}} --version {{latest}} {{cluster_name}}`
+
+- List all Kubernetes clusters:
+
+`doctl kubernetes cluster list`
+
+- Fetch and save the kubeconfig:
+
+`doctl kubernetes cluster kubeconfig save {{cluster_name}}`
+
+- Check for available upgrades:
+
+`doctl kubernetes cluster get-upgrades {{cluster_name}}`
+
+- Upgrade a cluster to a new Kubernetes version:
+
+`doctl kubernetes cluster upgrade {{cluster_name}}`
+
+- Delete a cluster:
+
+`doctl kubernetes cluster delete {{cluster_name}}`