added scholar-extras link

README.md

@@ -6,6 +6,10 @@ extensions to [Jekyll](http://jekyllrb.com/), the awesome, blog aware, static
 site generator; it formats your bibliographies and reading lists for the web
 and gives your blog posts citation super-powers.
 
+For additional features you may also want to take a look at
+[jekyll-scholar-extras](https://github.com/hdpatel/jekyll-scholar-extras).
+
+
 Installation
 ------------