Add an yaml example

Signed-off-by: RainbowMango <renhongcai@huawei.com>

artifacts/example/overridepolicy_image.yaml

@@ -0,0 +1,18 @@
+apiVersion: policy.karmada.io/v1alpha1
+kind: OverridePolicy
+metadata:
+  name: example-override
+  namespace: default
+spec:
+  resourceSelectors:
+    - apiVersion: apps/v1
+      kind: Deployment
+  targetCluster:
+    labelSelector:
+      matchLabels:
+        location: us
+  overriders:
+    imageOverrider:
+      - component: Registry
+        operator: replace
+        value: fictional.registry.us