BAEL-1510 README (eugenp#3918)

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rxjava/README.md

@@ -9,3 +9,4 @@
 - [Introduction to rxjava-jdbc](http://www.baeldung.com/rxjava-jdbc)
 - [Schedulers in RxJava](http://www.baeldung.com/rxjava-schedulers)
 - [Mathematical and Aggregate Operators in RxJava](http://www.baeldung.com/rxjava-math)
+- [Combining Observables in RxJava](http://www.baeldung.com/rxjava-combine-observables)