添加shutdown和startup指令

Author: haizhilin2013

docs-cn/HTTP Directives/shutdown.md

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+# shutdown
+shutdown executes a command when the server exits. This is useful for performing cleanup or stopping a background process like php-fpm. (Also see startup.)
+
+Each command that is executed at shutdown is blocking. The output and error of the command go to stdout and stderr, respectively. There is no stdin.
+
+Note that shutdown commands will not execute if Caddy is force-terminated, for example, by using a "Force Quit" feature provided by your operating system. However, a typical SIGINT (Ctrl+C) will allow the shutdown commands to execute.
+
+Even if this directive is shared by more than one host, the command will only execute once per appearance in the Caddyfile.
+
+## 语法
+shutdown command
+
+command is the command to execute; it may be followed by arguments
+
+## 例子
+Stop php-fpm when the server quits:
+
+shutdown /etc/init.d/php-fpm stop

docs-cn/HTTP Directives/startup.md

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+# startup
+startup executes a command when the server begins. This is useful for preparing to serve a site by running a script or starting a background process like php-fpm. (Also see shutdown.)
+启动在服务器开始时执行命令。 这对于通过运行脚本或启动像php-fpm这样的后台进程来准备服务站点是非常有用的。 （另请参见关机。）
+
+Each command that is executed at startup is blocking, unless you suffix the command with a space and &, which will cause the command to be run in the background. The output and error of the command go to stdout and stderr, respectively. There is no stdin.
+在启动时执行的每个命令都是阻塞的，除非后缀有空格和＆，这将导致命令在后台运行。 命令的输出和错误分别转到stdout和stderr。 没有标准
+
+A command will only be executed once for each time it appears in the Caddyfile.
+每次只能在Caddyfile中执行一次命令。
+
+## 语法
+```
+startup command
+```
+
+`command` 是一个可执行的命令，它的后面可以带有参数
+
+## 例子
+在服务开始监听之前启动php-fpm：
+
+```
+startup /etc/init.d/php-fpm start
+```
+
+在Windows系统上，当命令的路径包含空格时，你可能需要使用引号：
+
+```
+startup "\"C:\Program Files\PHP\v7.0\php-cgi.exe\" -b 127.0.0.1:9123" &
+```