一个 MCDReforged 插件，需要 MCDR > 2.0
当玩家加入游戏时向其发送欢迎信息
别忘了填写配置文件 config/joinMOTD.json
如果配置文件中指定了 start_day（格式：%Y-%m-%d，如 2018-11-09），则将使用 start_day 计算开服时间，否则将尝试导入 daycount 插件进行开服时间获取
A MCDReforged plugin, requires MCDR > 2.0
Send player a MOTD when he joins
Don't forget to fill configure file config/joinMOTD.json
If start_day (format: %Y-%m-%d, e.g. 2018-11-09) is specified in the config file, start_day will be used to calculate the start time, otherwise it will try to import the daycount plugin to get the start time