fix: readme formatting and add test

Author: ongch

LeetcodeProblemsTests/Algorithms/Reverse_Integer_Test.js

@@ -0,0 +1,11 @@
+const assert = require('assert');
+const reverseInteger = require('../../LeetcodeProblems/Algorithms/Reverse_Integer').reverseInteger;
+
+var test = function() {
+  assert.equal(reverseInteger(123), 321);
+  assert.equal(reverseInteger(-123), -321);
+  assert.equal(reverseInteger(120), 21);
+}
+
+
+module.exports.test = test;

README.md

@@ -62,7 +62,7 @@ To run a specific problem in your console run  `node <problem_file_path>` (e.g.
 | [Construct Binary Tree from Preorder and Inorder Traversal ](/LeetcodeProblems/Algorithms/Construct_Binary_Tree_from_Preorder_and_Inorder_Traversal.js)   | Medium | https://leetcode.com/problems/construct-binary-tree-from-preorder-and-inorder-traversal/ | 
 | [Lowest Common Ancestor of a Binary Tree ](/LeetcodeProblems/Algorithms/Lowest_Common_Ancestor_of_a_Binary_Tree.js) | Medium | https://leetcode.com/problems/lowest-common-ancestor-of-a-binary-tree/ |
 | [Maximum Sum of an Hourglass](/LeetcodeProblems/Algorithms/Maximise_Hour_Glass_Sum.js)                          | Medium | https://leetcode.com/problems/maximum-sum-of-an-hourglass/ |
-| [Reverse Integer](/LeetcodeProblems/Algorithms/Reverse_Integer.js)                          | Medium | https://leetcode.com/problems/reverse-integer/ |
+| [Reverse Integer](/LeetcodeProblems/Algorithms/Reverse_Integer.js)                                              | Medium | https://leetcode.com/problems/reverse-integer/ |
 | [Flood Fill ](/LeetcodeProblems/Algorithms/Flood_Fill.js)                                                       | Easy   | https://leetcode.com/problems/flood-fill/ |
 | [Implement stack using queues ](/LeetcodeProblems/Algorithms/Implement_stack_using_queues.js)                   | Easy   | https://leetcode.com/problems/implement-stack-using-queues/ |
 | [Number of Segments in a String ](/LeetcodeProblems/Algorithms/Number_of_Segments_in_a_String.js)               | Easy   | https://leetcode.com/problems/number-of-segments-in-a-string/ |