added code source

Author: mauricechouam

Running Sum of 1d Array/code.js

@@ -0,0 +1,14 @@
+/*
+ * @param {number[]} nums
+ * @return {number[]}
+ */
+var runningSum = function(nums) {
+    var tab =[];
+    
+    tab[0]=nums[0];
+    for(let i=1; i<nums.length;i++){
+        tab[i]= tab[i-1]+nums[i];
+    }
+    return tab;
+    
+};