Update features doc

README.md

@@ -253,7 +253,9 @@ Getting cluster info and generating kubekey's configuration file (optional).
 
 ## Documents
 
+* [Features List](docs/features.md)
 * [Configuration example](docs/config-example.md)
+* [Air-Gapped Installation](docs/manifest_and_artifact.md)
 * [Highly Available clusters](docs/ha-mode.md)
 * [Addons](docs/addons.md)
 * [Network access](docs/network-access.md)

docs/features.md

@@ -37,6 +37,7 @@
 
 ### Air-Gapped Installation
 
+- Customize and use the [air-gapped installation package](manifest_and_artifact.md)
 - Create a private image registry
 - Customize images available in the private image registry 
 

docs/manifest_and_artifact.md

@@ -60,6 +60,10 @@ After execution, the `kubekey-artifact.tar.gz` file will be generated in the cur
  ```
 ./kk init registry -f config-sample.yaml -a kubekey-artifact.tar.gz
 ```
+* Push the image to the private image registry.
+```
+./kk artifact image push -f config-sample.yaml -a kubekey-artifact.tar.gz
+```
 * Create the cluster.
 > Note: In an offline environment, you need to configure private image registry information for cluster image management, please refer to [config-sample.yaml](./config-example.md) and [container image registry](./registry.md).
 

docs/zh/manifest_and_artifact.md

@@ -59,6 +59,10 @@ kk 通过 `kubeconfig` 文件连接对应的 Kubernetes 集群，然后检查出
 ```
 ./kk init registry -f config-sample.yaml -a kubekey-artifact.tar.gz
 ```
+* 推送镜像到私有镜像仓库
+```
+./kk artifact image push -f config-sample.yaml -a kubekey-artifact.tar.gz
+```
 * 创建集群。
 > 注意：在离线环境中，需配置私有镜像仓库信息用于集群镜像的管理，相关配置可参考 [config-sample.yaml](../config-example.md) 和 [容器镜像仓库](../registry.md)。
 ```