add link to github page

README.md

@@ -4,7 +4,7 @@ Graphexp is a web interface to explore and display a graph stored in the Gremlin
 
 ![graphexp](https://github.com/bricaud/graphexp/blob/master/images/graphexp2.png "Graph exploration")
 
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+A live demo of Graphexp is available on the [project Github page](https://bricaud.github.io/graphexp/)
 
 ## Configuration
 
@@ -103,4 +103,7 @@ You may also color the nodes according to the values of some of their properties
 
 If you want to explore the world of insects, you may start with the taxon 'Insecta' and follow the links.
 
+Have a try on the live demo of Graphexp on the [project Github page](https://bricaud.github.io/graphexp/).
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