2.1 Added `from(future, timeout)

Author: Froussios

Part 2 - Sequence Basics/1. Creating a sequence.md

@@ -276,6 +276,12 @@ Completed
 
 The observable emits the result of the `FutureTask` when it is available and then terminates. If the task is canceled, the observable will emit a `java.util.concurrent.CancellationException` error.
 
+If you're interested in the results of the `Future` for a limited amount of time, you can provide a timeout period like this
+```java
+Observable<Integer> values = Observable.from(f, 1000, TimeUnit.MILLISECONDS);
+```
+If the `Future` has not completed the specified amount of time, the observable will ignore it and fail with a `TimeoutException`.
+
 You can also turn any collection into an observable using the overloads of `Observable.from` that take arrays and iterables. This will result in every item in the collection to be emitted and then the observable will terminate.
 
 ```java