Add blockquote example to the index page

Author: matusnovak

example/src/Engine.hpp

@@ -123,6 +123,10 @@ The distance between \f$(x_1,y_1)\f$ and \f$(x_2,y_2)\f$ is
           \right|
   \f]
 
+## Blockquote
+
+> This is some random blockquote!
+
 */
 
 //-----------------------------------------------------------