update document

paddle_fl/examples/k8s_deployment/deploy_instruction.md

-# K8S cluster application
+#K8S cluster application
+Here is a guide for you to apply your K8S cluster on [Baidu Cloud](https://cloud.baidu.com/doc/CCE/s/zjxpoqohb)
+The number of CPU cores should be larger than 8
+<img src='fl_node.png' width = "400" height = "160">
+
 # kubectl installation 
 ```sh
+#download newest version
 curl -LO "https://storage.googleapis.com/kubernetes-release/release/$(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt)/bin/darwin/amd64/kubectl"
+#add authorization for kubectl execution 
 chmod +x ./kubectl
+#move the execuable file to the enviroment path
 sudo mv ./kubectl /usr/local/bin/kubectl
+#check installation and get the version
 kubectl version
 ```
+# Add configuration for kubectl
+
+After installing kubectl, we need to add some configurations for kubectl.
+
+You can find the status of your cluster and download the certication [here](https://cloud.baidu.com/doc/CCE/index.html#.E6.9F.A5.E7.9C.8B.E9.9B.86.E7.BE.A4)
+
+<img src='status.png' width = "400" height = "160">
+
+Finally, move the certification to default path of kubectl and you can access the remote K8S cluster on your machine
+
+```sh
+mv kubectl.conf  ~/.kube/config
+
+kubectl get node
+```