doc(tpl): add notes for shotcut keys

Author: marjune163

README.md

@@ -272,3 +272,13 @@ server [options]
     server will try to use first virtual host that has no hostname,
     otherwise use the first virtual host.
 ```
+
+## Shortcut key for default page template
+- `←`, `→`: move focus between path items
+- `Ctrl`/`Cmd` + `←`: move focus to first path item
+- `Ctrl`/`Cmd` + `→`: move focus to last path item
+- `↑`, `↓`: move focus between file items
+- `Ctrl`/`Cmd` + `↑`: move focus to first file item
+- `Ctrl`/`Cmd` + `↓`: move focus to last file item
+- Repeat inputting same character will look for next file that prefixes with it.
+- Non-repeat inputs will be remembered as a string in short time to look for next file prefix match.

README.zh-CN.md

@@ -270,3 +270,13 @@ server [选项]
     服务器尝试使用第一个没有指定主机名的虚拟主机，
     如果失败则使用第一个虚拟主机。
 ```
+
+## 默认页面模板的快捷键
+- `←`, `→`：使焦点在路径项之间移动
+- `Ctrl`/`Cmd` + `←`：把焦点移动到第一个路径项
+- `Ctrl`/`Cmd` + `→`：把焦点移动到最后一个路径项
+- `↑`, `↓`：使焦点在文件项之间移动
+- `Ctrl`/`Cmd` + `↑`：把焦点移动到第一个文件项
+- `Ctrl`/`Cmd` + `↓`：把焦点移动到最后一个文件项
+- 重复输入相同字符将查找下一个前缀匹配该字符的文件。
+- 输入不重复的字符，将在短时间内被记忆为字符串，用于查找下一个前缀匹配的文件。