Update README.md

Author: khjxiaogu

README.md

@@ -6,13 +6,16 @@ Minecraft version: 1.8.1+
 1. Install this plugin in your minecraft server's plugins folder(Server Directory/plugins/).   
 2. Start server, wait before fully loaded and generates a folder named "MCMIDI".   
 3. Place your midi music files inside MCMIDI folder.   
-2. Use`/mcmidi load foo.mid`to load foo.mid into memory before first play.    
-3. After loading,you can use`/mcmidi play foo.mid player`to play midi for a player or`/mcmidi play foo.mid` to play for yourself.   
+4. Use`/mcmidi load foo.mid`to load foo.mid into memory before first play.    
+5. After loading,you can use`/mcmidi play foo.mid player`to play midi for a player or`/mcmidi play foo.mid` to play for yourself.   
+6. If you wants to generate note block structure, use `/mcmidi generate foo.mid` to generate a note block structure right at your location.  
 # Regards
 - Server tps may affect play speed.
 - Midi files that are too fast may have some notes lost, the smallest time unit is a minecraft tick(50ms), notes closer than this may be considered as notes at the same moment.  
 - The velocity,pressure or volume of a single key would not be considered as there's no way to present this in minecraft.  
-- Only speed change message and KEY_ON messages would take effect.
+- Only midi speed change message and key press messages would take effect.  
+- generating structure may cause performance issues. There's no undo, so be careful!
+- structure width must larger than 10, you can calculate a approxmate value by lengthInTicks*3(cell width)/250(height).
 # Minecraft midi播放器   
 适用于minecraft服务器的midi插件   
 Minecraft版本：1.8.1+   
@@ -23,8 +26,11 @@ Minecraft版本：1.8.1+
 3. 把midi音乐放在插件文件夹下MCMIDI文件夹内（服务器目录/plugins/MCMIDI）。  
 4. 首次播放某个音乐时，需要使用`/mcmidi load 测试.mid`加载"测试.mid"到服务器缓存。  
 5. 载入后，就可以使用`/mcmidi play 测试.mid 玩家`为玩家播放"测试.mid"，或者`/mcmidi play 测试.mid`为自己播放了。  
+6. 也可以使用`/mcmidi generate 测试.mid`在你所在位置生成一个红石音乐结构。  
 # 注意事项
 - 服务器tps会影响播放速度。  
 - 过快的midi文件可能会出现音符丢失，最小时间单位是1 mc tick(50ms)，间隔低于这个的音符会被认为是同一时间内的音符。
 - 速度、压力和音量属性都不会被使用，因为在minecraft内很难表达这些属性
-- 只有速度变化和按键按下信息会生效
+- 只有midi速度变化和按键按下信息会生效
+- 生成红石音乐会导致性能问题和卡服，不能撤销，请慎重操作！
+- 结构宽度最低为16，可以近似计算长度为 tick长度*3(单元宽度)/250(高度)