Update README.md

Author: thomasnield

README.md

@@ -4,6 +4,9 @@ Learn more about RxJava on the <a href="https://github.com/ReactiveX/RxJava/wiki
 
 RxJavaFX is a simple API to convert JavaFX events into RxJava Observables and vice versa. It also has a scheduler to safely move emissions to the JavaFX Event Dispatch Thread. 
 
+**DOCUMENTATION:** [Learning RxJava with JavaFX (EAP)](https://www.gitbook.com/book/thomasnield/rxjavafx-guide/details)
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 **NOTE**: To use with [Kotlin](http://kotlinlang.org/), check out [RxKotlinFX](https://github.com/thomasnield/RxKotlinFX) to leverage this library with extension functions and additional operators. 
 
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