doc: 更新文档

Author: DesnLee

README-CN.md

@@ -39,6 +39,20 @@ ssm new
 - `--port` 或 `-p` ：指定端口映射，默认为 `3000`，且必须可用，如果您传递了 `-i` 标标志来创建一个前端容器，则默认端口为 `80`。如果你想使用域名访问服务，则需要使用反向代理工具（如 Nginx 或 Caddy）手动代理该端口。
 
 
+### update
+
+更新一个 Sub-Store Docker 容器，确保镜像已经存在且正在运行。
+
+```bash
+ssm update
+```
+
+该命令支持以下 `flag`：
+
+- `--name` 或 `-n` ：一个正在运行的容器名称，默认名称为 `ssm-backend`。
+
+- `--version` 或 `-v` ：一个 [Sub-Store Release](https://github.com/sub-store-org/Sub-Store/releases) 的版本字符串，默认获取最新版本。如果您更新目标为前端容器，则 `-v` 标志将被忽略，它总是使用最新版本的前端。
+
 
 ### start
 

README.md

@@ -40,6 +40,21 @@ this command support the following flags:
 - `--port` or `-p` : To successfully create a new Docker container, you need to specify the port mapping. The default port is `3000`, and it must be available. If you pass `-i` to create a front-end container, the default port will be `80`. If you want to access the container using a domain name, you will need to manually proxy this port with a reverse proxy tool such as Nginx or Caddy.
 
 
+### update
+
+To update a sub-store docker container, ensure that the image already exists and is running.
+
+```bash
+ssm update
+```
+
+this command support the following flags:
+
+- `--name` or `-n` : A name of running container, default name is `ssm-backend`.
+
+- `--version` or `-v` : A [Sub-Store release](https://github.com/sub-store-org/Sub-Store/releases) version string, default is latest. If you update a front-end container, `-v` will be ignored, it always uses the latest version of the front-end.
+
+
 ### start
 
 Start a non-running sub-store Docker container by name, default name set as `ssm-backend`.