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

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

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

@@ -67,7 +67,7 @@ vela show spark-application
 
 # Example for how to run a component typed spark-cluster in application
 
-1. Secondly, copy the following example to "spark-app-v1.yaml":
+1. Firstly, copy the following example to "spark-app-v1.yaml":
 
 > The addon will create a namespace named "spark-cluster"
 
@@ -95,5 +95,24 @@ spec:
       executorCores: 1
 ```
 
+2. Secondly, start the application:
+
+```
+vela up -f spark-app-v1.yaml
+```
+
+You will see the stdout like this:
+
+```
+Applying an application in vela K8s object format...
+I0227 16:54:37.069480  361176 apply.go:121] "creating object" name="spark-app-v1" resource="core.oam.dev/v1beta1, Kind=Application"
+✅ App has been deployed 🚀🚀🚀
+    Port forward: vela port-forward spark-app-v1 -n spark-cluster
+             SSH: vela exec spark-app-v1 -n spark-cluster
+         Logging: vela logs spark-app-v1 -n spark-cluster
+      App status: vela status spark-app-v1 -n spark-cluster
+        Endpoint: vela status spark-app-v1 -n spark-cluster --endpoint
+Application spark-cluster/spark-app-v1 applied.
+```