tweak readme

Operators.md

@@ -123,7 +123,7 @@ ReactiveX的每种编程语言的实现都实现了一组操作符的集合。
 * [RefCount](operators/RefCount.md) — 使一个可连接的Observable表现得像一个普通的Observable
 * [Replay](operators/Replay.md) — 确保所有的观察者收到同样的数据序列，即使他们在Observable开始发送数据之后才订阅
 
-### 其它操作
+### 转换操作
 
 * [To](operators/To.md) — 将Observable转换为其它的对象或数据结构
 

README.md

@@ -11,26 +11,26 @@
 
 ## 目录
 
-* [ReactiveX](Intro.md)
-* [Observables](Observables.md)
-* [Single](Single.md)
-* [Subject](Subject.md)
-* [Scheduler](Scheduler.md)
-* [所有的操作符列表](All-Operators-List.md)
-* [操作符分类列表](Operators.md)
-  * [创建操作](operators/Creating-Observables.md)
-  * [变换操作](operators/Transforming-Observables.md)
-  * [过滤操作](operators/Filtering-Observables.md)
-  * [结合操作](operators/Combining-Observables.md)
-  * [错误处理](operators/Error-Handling-Operators.md)
-  * [辅助操作](operators/Observable-Utility-Operators.md)
-  * [条件和布尔操作](operators/Conditional-and-Boolean-Operators.md)
-  * [算术和聚合操作](operators/Mathematical-and-Aggregate-Operators.md)
-  * [异步操作](operators/Async-Operators.md)
-  * [连接操作](operators/Connectable-Observable-Operators.md)
-  * [转换操作](operators/To.md)
-  * [阻塞操作](operators/Blocking-Observable-Operators.md)
-  * [字符串操作](operators/String-Observables.md)
+* [ReactiveX](Intro.md) - 什么是Rx，Rx的理念和优势
+* [Observables](Observables.md) - 简要介绍Observable的观察者模型
+* [Single](Single.md) - 一种特殊的只发送单个值的Observable
+* [Subject](Subject.md) - Observable和Observer的复合体，也是二者的桥梁
+* [Scheduler](Scheduler.md) - 介绍了各种异步任务调度和默认调度器
+* [All Operators List](All-Operators-List.md) - 按字母顺序的全部操作符列表
+* [Operators Categories](Operators.md) - 按目录分类的主要操作符列表
+  * [Creating 创建操作](operators/Creating-Observables.md) - Create/Defer/From/Just/Start/Repeat/Range
+  * [Transforming 变换操作](operators/Transforming-Observables.md) - Buffer/Window/Map/FlatMap/GroupBy/Scan
+  * [Filtering 过滤操作](operators/Filtering-Observables.md) - Debounce/Distinct/Filter/Sample/Skip/Take
+  * [Combining 结合操作](operators/Combining-Observables.md) - And/StartWith/Join/Merge/Switch/Zip
+  * [Error Handling 错误处理](operators/Error-Handling-Operators.md) - Catch/Retry
+  * [Utility 辅助操作](operators/Observable-Utility-Operators.md) - Delay/Do/ObserveOn/SubscribeOn/Subscribe
+  * [Conditional 条件和布尔操作](operators/Conditional-and-Boolean-Operators.md) - All/Amb/Contains/SkipUntil/TakeUtil
+  * [Mathematical 算术和聚合操作](operators/Mathematical-and-Aggregate-Operators.md) - Average/Concat/Count/Max/Min/Sum/Reduce
+  * [Async 异步操作](operators/Async-Operators.md) - start/toAsync/startFuture/fromAction/fromCallable/runAsync
+  * [Connect 连接操作](operators/Connectable-Observable-Operators.md) - Connect/Publish/RefCount/Replay
+  * [Convert 转换操作](operators/To.md) - ToFuture/ToList/ToIterable/ToMap/toMultiMap
+  * [Blocking 阻塞操作](operators/Blocking-Observable-Operators.md) - forEach/First/Last/mostRecent/next/single/latest
+  * [String 字符串操作](operators/String-Observables.md) - byLine/decode/encode/from/join/split/stringConcat
 * [RxJava文档和教程](Topics.md)
   * [RxJava入门指南](topics/Getting-Started.md)
   * [RxJava使用示例](topics/How-To-Use-RxJava.md)