[Addon kubevela#603] Add Apache Spark as a experimental addon

Signed-off-by: yanghua <yanghua1127@gmail.com>

experimental/addons/spark-kubernetes-operator/README.md

@@ -115,4 +115,49 @@ I0227 16:54:37.069480  361176 apply.go:121] "creating object" name="spark-app-v1
 Application spark-cluster/spark-app-v1 applied.
 ```
 
+3. Then, you can use the native command to check the status of the Spark applicaiton:
+
+```
+$ kubectl get sparkapplications -n spark-cluster
+NAME           STATUS    ATTEMPTS   START                  FINISH       AGE
+my-spark-app   RUNNING   1          2023-02-27T08:54:40Z   <no value>   2m33s
+```
+
+or get the application detail via this command:
+
+```
+$ kubectl describe sparkapplication my-spark-app -n spark-cluster
+Name:         my-spark-app
+Namespace:    spark-cluster
+Labels:       app.oam.dev/app-revision-hash=4e5592aea53a5961
+              app.oam.dev/appRevision=spark-app-v1-v1
+              app.oam.dev/cluster=local
+              app.oam.dev/component=my-spark-application-component
+              app.oam.dev/name=spark-app-v1
+              app.oam.dev/namespace=spark-cluster
+              app.oam.dev/resourceType=TRAIT
+              app.oam.dev/revision=
+              oam.dev/render-hash=640a3298d803274e
+              trait.oam.dev/resource=spark
+              trait.oam.dev/type=AuxiliaryWorkload
+Annotations:  app.oam.dev/last-applied-configuration:
+                {"apiVersion":"sparkoperator.k8s.io/v1beta2","kind":"SparkApplication","metadata":{"annotations":{"app.oam.dev/last-applied-time":"2023-02...
+              app.oam.dev/last-applied-time: 2023-02-27T16:54:37+08:00
+              oam.dev/kubevela-version: v1.7.0
+API Version:  sparkoperator.k8s.io/v1beta2
+Kind:         SparkApplication
+Metadata:
+......
+```
+
+or get the general purpose detail information via this command:
+
+```
+$ kubectl get app spark-app-v1 -n spark-cluster -oyaml
+apiVersion: core.oam.dev/v1beta1
+kind: Application
+metadata:
+......
+```
+