Added kotlinx-coroutines-android module to the top page of documentation site

Author: elizarov

site/docs/index.md

@@ -8,14 +8,14 @@ layout: api
 Library support for Kotlin coroutines. This reference is a companion to 
 [Guide to kotlinx.coroutines by example](https://github.com/Kotlin/kotlinx.coroutines/blob/master/coroutines-guide.md).
 
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 ## Modules
 
-[kotlinx-coroutines-core](kotlinx-coroutines-core) | Core primitives to work with coroutines.
-[kotlinx-coroutines-jdk8](kotlinx-coroutines-jdk8) | Additional libraries for JDK8 (or Android API level 24).
-[kotlinx-coroutines-nio](kotlinx-coroutines-nio) | Extensions for asynchronous IO on JDK7+.
-[kotlinx-coroutines-swing](kotlinx-coroutines-swing) | `Swing` context for Swing UI applications.
-[kotlinx-coroutines-javafx](kotlinx-coroutines-javafx) | `JavaFx` context for JavaFX UI applications.
+[kotlinx-coroutines-core](kotlinx-coroutines-core)         | Core primitives to work with coroutines
+[kotlinx-coroutines-jdk8](kotlinx-coroutines-jdk8)         | Additional libraries for JDK8 (or Android API level 24)
+[kotlinx-coroutines-nio](kotlinx-coroutines-nio)           | Extensions for asynchronous IO on JDK7+
 [kotlinx-coroutines-reactive](kotlinx-coroutines-reactive) | Utilities for [Reactive Streams](http://www.reactive-streams.org)
-[kotlinx-coroutines-rx1](kotlinx-coroutines-rx1) | Utilities for [RxJava 1.x](https://github.com/ReactiveX/RxJava/tree/1.x)
-[kotlinx-coroutines-rx2](kotlinx-coroutines-rx2) | Utilities for [RxJava 2.x](https://github.com/ReactiveX/RxJava)
+[kotlinx-coroutines-rx1](kotlinx-coroutines-rx1)           | Utilities for [RxJava 1.x](https://github.com/ReactiveX/RxJava/tree/1.x)
+[kotlinx-coroutines-rx2](kotlinx-coroutines-rx2)           | Utilities for [RxJava 2.x](https://github.com/ReactiveX/RxJava)
+[kotlinx-coroutines-android](kotlinx-coroutines-android)   | `UI` context for Android applications
+[kotlinx-coroutines-javafx](kotlinx-coroutines-javafx)     | `JavaFx` context for JavaFX UI applications
+[kotlinx-coroutines-swing](kotlinx-coroutines-swing)       | `Swing` context for Swing UI applications