updating readme for appdeploy samples.

Author: jeroenterheerdt

samples/features/sql-big-data-cluster/app-deploy/README.md

@@ -22,6 +22,7 @@ These samples demonstrates how you can deploy a simple R app into SQL Server big
 |Sample|Description|
 |-|-|
 |__[RollDice](RollDice/)__|This sample demonstrates the use of data frames by rolling dices|
+|__[sumofsq](sumofsq/)__|Returns the sum of squares of two input numbers|
 
 ### MLeap