Added Shuffle_String problem test

Author: anonimak

LeetcodeProblemsTests/Algorithms/Shuffle_String_Test.js

@@ -0,0 +1,10 @@
+const assert = require('assert');
+const restoreString = require('../../LeetcodeProblems/Algorithms/Shuffle_String').restoreString;
+
+var test = function () {
+  assert.equal(restoreString('codeleet',[4,5,6,7,0,2,1,3]),'leetcode');
+  assert.equal(restoreString('abc',[0,1,2]),'abc');
+  assert.equal(restoreString('hacktoberfest',[9,10,11,12,4,5,6,7,8,0,1,2,3]),'festtoberhack');
+}
+
+module.exports.test = test;