Update docs

README-zh.md

@@ -72,6 +72,35 @@ https://gitlab.com/hwdsl2/openvpn-install/-/raw/master/openvpn-install.sh
 
 如果无法下载，打开 [openvpn-install.sh](openvpn-install.sh)，然后点击右边的 `Raw` 按钮。按快捷键 `Ctrl/Cmd+A` 全选，`Ctrl/Cmd+C` 复制，然后粘贴到你喜欢的编辑器。
 </details>
+<details>
+<summary>
+高级：使用自定义选项自动安装。
+</summary>
+
+高级用户可以使用自定义选项自动安装 OpenVPN，方法是提供一个 Bash "here document" 作为安装脚本的输入。此方法还可用于在安装后提供输入以管理用户。
+
+首先，使用自定义选项以交互方式安装 OpenVPN，并写下你对脚本的所有输入值。
+
+```bash
+sudo bash openvpn.sh
+```
+
+如需删除 OpenVPN，请再次运行脚本并选择适当的选项。
+
+然后使用你的输入值创建自定义安装命令。例如：
+
+```bash
+sudo bash openvpn.sh <<ANSWERS
+1
+1194
+2
+client
+y
+ANSWERS
+```
+
+**注：** 安装选项可能会在脚本的未来版本中发生变化。
+</details>
 
 \* 一个云服务器，虚拟专用服务器 (VPS) 或者专用服务器。
 

README.md

@@ -72,6 +72,35 @@ https://gitlab.com/hwdsl2/openvpn-install/-/raw/master/openvpn-install.sh
 
 If you are unable to download, open [openvpn-install.sh](openvpn-install.sh), then click the `Raw` button on the right. Press `Ctrl/Cmd+A` to select all, `Ctrl/Cmd+C` to copy, then paste into your favorite editor.
 </details>
+<details>
+<summary>
+Advanced: Auto install using custom options.
+</summary>
+
+Advanced users can auto install OpenVPN using custom options, by providing a Bash "here document" as input to the setup script. This method can also be used to provide input to manage users after install.
+
+First, install OpenVPN interactively using custom options, and write down all your inputs to the script.
+
+```bash
+sudo bash openvpn.sh
+```
+
+If you need to remove OpenVPN, run the script again and select the appropriate option.
+
+Next, create the custom install command using your inputs. Example:
+
+```bash
+sudo bash openvpn.sh <<ANSWERS
+1
+1194
+2
+client
+y
+ANSWERS
+```
+
+**Note:** The install options may change in future versions of the script.
+</details>
 
 \* A cloud server, virtual private server (VPS) or dedicated server.