add new problem invert values

Author: anasmak04

Diff for: problem-29.js

@@ -0,0 +1,14 @@
+/*Given a set of numbers, return the additive inverse of each. 
+Each positive becomes negatives, and the negatives become positives.
+ You can assume that all values are integers.*/
+
+function invert(array) {
+    const arr = [];
+    if (array.length == 0)
+        return array
+    for (let e of array) {
+        arr.push(-e)
+    }
+
+    return arr;
+}