Update README.md

README.md

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-Visavail.js - A Time Data Availability Visualization Chart
+Visavail.js - A Time Data Availability Visualization
 =============================
 This library visualizes the availability of time-dependent data with a chart on a website.
 
@@ -14,6 +14,10 @@ An example use case is the visualization of a dataset that contains time-depende
 
 The Visavail.js library takes single data points with dates and information about data availability as inputs, combines them into time blocks, and visualizes these blocks.
 
+Demo
+----
+A demo of Visavail.js in action is displayed at [http://bit.ly/1tevllL](http://bit.ly/1tevllL). The source code of the demo is shown in [example.htm](example.htm).
+
 Usage
 -----
 Input data format, display style and implementation have to be considered for using the Visavail.js library successfully. An example is provided in the file [example.htm](example.htm). Code of this file is explained below.