Add rCharts demo using Highcharts

Change-Id: I4d348937b5db7888def2ccc763d9171de2cfbc46
diff --git a/demo/00Index b/demo/00Index
index b954748..f16c2dc 100644
--- a/demo/00Index
+++ b/demo/00Index
@@ -4,3 +4,4 @@
 alternativesOverTime      Plot proportion of alternative spellings/variants over time
 regional                  Map plot regional frequencies of query expression
 mosaicplot                Visualize frequencies of alternative query terms in relation to other variables
+rcharts-highcharts        Visualize term frqequencies over time with interactive HTML and JavaScript elements