Add a Bitdeli badge to README

Author: bitdeli-chef

README.md

@@ -4,4 +4,7 @@ Site NAMD
 http://NAMD.github.io
 
 * Nikola 6.4
-* Bootstrap 2.3.2
+* Bootstrap 2.3.2
+
+[![Bitdeli Badge](https://d2weczhvl823v0.cloudfront.net/NAMD/namd.github.io/trend.png)](https://bitdeli.com/free "Bitdeli Badge")
+