dev-v2.0.0: update config example and readme

Signed-off-by: 24sama <leo@kubesphere.io>

README.md

@@ -244,6 +244,7 @@ Getting cluster info and generating kubekey's configuration file (optional).
 ## Documents
 
 * [Configuration example](docs/config-example.md)
+* [Highly Available clusters](docs/ha-mode.md)
 * [Addons](docs/addons.md)
 * [Network access](docs/network-access.md)
 * [Storage clients](docs/storage-client.md)

README_zh-CN.md

@@ -264,6 +264,7 @@ kubectl completion bash >/etc/bash_completion.d/kubectl
 ## 相关文档
 
 * [配置示例](docs/config-example.md)
+* [高可用集群](docs/ha-mode.md)
 * [自定义插件安装](docs/addons.md)
 * [网络访问](docs/network-access.md)
 * [存储客户端](docs/storage-client.md)

docs/config-example.md

@@ -18,6 +18,8 @@ spec:
     - node1
     - node[10:100] # All the nodes in your cluster that serve as the worker nodes.
   controlPlaneEndpoint:
+    internalLoadbalancer: haproxy #Internal loadbalancer for apiservers. [Default: ""]
+    
     domain: lb.kubesphere.local
     address: ""      # The IP address of your load balancer.
     port: 6443