Adds best solution

src/main/scala/algorithms/DiagonalDifference/SolutionBest.scala

@@ -0,0 +1,26 @@
+package algorithms.DiagonalDifference
+
+import scala.io._
+
+/**
+  * Created by jll on 3/27/2017.
+  * Found here : https://codepair.hackerrank.com/paper/X2RXZXPW?b=eyJyb2xlIjoiY2FuZGlkYXRlIiwibmFtZSI6IkFpcmJhbGxtYW4iLCJlbWFpbCI6ImpsZW5ncmFuZEBnbWFpbC5jb20ifQ%3D%3D
+  */
+class SolutionBest {
+
+    def main(args: Array[String]) = {
+      val size = StdIn.readInt()
+
+      var lr: Int = 0
+      var rl: Int = 0
+
+      for(i <- 0 to (size - 1)) {
+        val rowStr = StdIn.readLine().split(" ")
+
+        lr += Integer.parseInt(rowStr(i))
+        rl += Integer.parseInt(rowStr(size - i - 1))
+      }
+
+      println(Math.abs(lr - rl))
+    }
+}