Update README.md

Author: MoRan1607

README.md

@@ -76,6 +76,7 @@
   1.[Zookeeper——Zookeeper概述](https://github.com/Dr11ft/BigDataGuide/blob/master/Zookeeper/Zookeeper%EF%BC%88%E4%B8%80%EF%BC%89.md)   
   2.[Zookeeper——Zookeeper单机和分布式安装](https://github.com/Dr11ft/BigDataGuide/blob/master/Zookeeper/Zookeeper%EF%BC%88%E4%BA%8C%EF%BC%89.md)   
   3.[Zookeeper——Zookeeper客户端命令](https://github.com/Dr11ft/BigDataGuide/blob/master/Zookeeper/Zookeeper%EF%BC%88%E4%B8%89%EF%BC%89.md)   
+  4.[Zookeeper——Zookeeper内部原理](https://github.com/Dr11ft/BigDataGuide/blob/master/Zookeeper/Zookeeper%EF%BC%88%E5%9B%9B%EF%BC%89.md)   
 
 ### 三、Hive
   1.[Hive——Hive概述](https://github.com/Dr11ft/BigDataGuide/blob/master/Hive/1%E3%80%81Hive%E6%A6%82%E8%BF%B0.md)