add doc and example

Signed-off-by: Tom <[email protected]>

docs/content/en/docs/fleet-manager/submariner-plugin.md

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+---
+title: "Enable multi cluster networking with Submariner"
+linkTitle: "Enable multi cluster networking with Submariner"
+weight: 20
+description: >
+  The easiest way to manage multi cluster submariner plugin with fleet.
+---
+
+In this tutorial we’ll cover the basics of how to use [Fleet](https://kurator.dev/docs/references/fleet-api/#fleet) to manage submariner plugin on a group of clusters.
+
+## Prerequisites
+
+1. Setup Fleet manager by following the instructions in the [installation guide](/docs/setup/install-fleet-manager/).
+
+2. Running the following command to create two secrets to access attached clusters.
+
+```bash
+kubectl create secret generic kurator-member1 --from-file=kurator-member1.config=/root/.kube/kurator-member1.config
+kubectl create secret generic kurator-member2 --from-file=kurator-member2.config=/root/.kube/kurator-member2.config
+```
+
+### Create a fleet with metric plugin enabled
+
+```bash
+kubectl apply -f examples/fleet/network/submariner-plugin.yaml
+```
+
+After a while, we can see the fleet is `ready`:
+
+```bash
+kubectl wait fleet quickstart --for='jsonpath='{.status.phase}'=Ready'
+```
+
+### Verify the Installation
+
+To ensure that the Submariner plugin is successfully installed and running.
+
+Run the following commands:
+
+```bash
+kubectl get pod --kubeconfig=/root/.kube/kurator-member1.config | grep submariner
+kubectl get pod --kubeconfig=/root/.kube/kurator-member2.config | grep submariner
+```
+
+## Cleanup
+
+Delete the fleet created
+
+```bash
+kubectl delete fleet quickstart
+```
+
+Uninstall fleet manager:
+
+```bash
+helm uninstall kurator-fleet-manager -n kurator-system
+```
+
+{{< boilerplate cleanup >}}

examples/fleet/network/submariner-plugin.yaml

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+apiVersion: cluster.kurator.dev/v1alpha1
+kind: AttachedCluster
+metadata:
+  name: kurator-member1
+  namespace: default
+spec:
+  kubeconfig:
+    name: kurator-member1
+    key: kurator-member1.config
+---
+apiVersion: cluster.kurator.dev/v1alpha1
+kind: AttachedCluster
+metadata:
+  name: kurator-member2
+  namespace: default
+spec:
+  kubeconfig:
+    name: kurator-member2
+    key: kurator-member2.config
+---
+apiVersion: fleet.kurator.dev/v1alpha1
+kind: Fleet
+metadata:
+  name: quickstart
+  namespace: default
+spec:
+  clusters:
+    - name: kurator-member1
+      kind: AttachedCluster
+    - name: kurator-member2
+      kind: AttachedCluster
+  plugin:
+    submariner:
+      extraArgs:
+        operator:
+          image:
+            pullPolicy: "IfNotPresent"
+        submariner:
+          natEnabled: true