[DOC] Edit setup content initial (#16)

Co-authored-by: Ryan Zhang <[email protected]>

content/docs/setup/getting-started/Using-the-cluster.md

@@ -0,0 +1,41 @@
+# Using the cluster
+
+You can use `kubectl` with the `mke` context to interact with the cluster,
+though it is necessary to specify the configuration. `mkectl` outputs the
+kubeconfig of the cluster to `~/mke/.mke.kubeconfig`.
+
+You can apply ``.mke.kubeconfig`` using any one of the following methods:
+
+- Set the KUBECONFIG env var to point to `~/.mke/mke.kubeconfig`
+
+  ```shell
+  export KUBECONFIG=~/.mke/<cluster name>.kubeconfig
+  ```
+
+- Append the contents to the default kubeconfig:
+
+  ```shell
+  cat ~/.mke/mke.kubeconfig >> ~/.kube/config
+  ```
+
+- Specify the config as a command argument:
+
+  ```shell
+  kubectl --kubeconfig ~/.mke/mke.kubeconfig
+  ```
+
+Example output:
+
+```text
+$ kubectl --context mke get nodes
+NAME    STATUS   ROLES           AGE   VERSION
+node1   Ready    <none>          2d    v1.29.3+k0s
+node2   Ready    control-plane   2d    v1.29.3+k0s
+```
+
+To modify the cluster configuration, edit the YAML configuration file and
+rerun the `apply` command.
+
+```shell
+mkectl apply -f mke.yaml
+```