Docs: Added Timelion topic

docs/index.asciidoc

@@ -29,6 +29,8 @@ include::visualize.asciidoc[]
 
 include::dashboard.asciidoc[]
 
+include::timelion.asciidoc[]
+
 include::console.asciidoc[]
 
 include::management.asciidoc[]

docs/timelion.asciidoc

@@ -0,0 +1,30 @@
+[[timelion]]
+== Timelion
+
+Timelion is a time series data visualizer that enables you to combine totally
+independent data sources within a single visualization. It's driven by a simple
+expression language you use to retrieve time series data, perform calculations
+to tease out the answers to complex questions, and visualize the results. 
+
+For example, Timelion enables you to easily get the answers to questions like:
+
+* How many pages does each unique user view over time?
+* What's the difference in traffic volume between this Friday and last Friday?
+* What percent of Japan's population came to my site today?
+* What's the 10-day moving average of the S&P 500?
+* What's the cumulative sum of all search requests received in the last 2 years?
+
+To start building time-series visualizations, click **Timelion** in the side
+navigation and run through the tutorial. Documentation for the Timelion
+expression language is built-in. Click **Docs** in the toolbar to view
+the available functions and access the tutorial. As you start to enter
+functions in the query bar, Timelion displays the available arguments:
+
+image::images/timelion-arg-help.jpg["Timelion inline help"]
+
+To incorporate a Timelion visualization into a Kibana dashboard, save the
+Timelion expression as a Kibana dashboard panel. You can then add it to
+a dashboard like any other visualization.
+
+
+