22w5: add 1929 js solution

Author: swiftwind0405

README.md

@@ -6,6 +6,7 @@
 
 | # | Title | Solution | Difficulty |
 |---| ----- | -------- | ---------- |
+|1929|[Concatenation of Array](https://leetcode.com/problems/concatenation-of-array/) | [js](./algorithms/concatenationOfArray/Solution.js)  |Easy|
 |1464|[Maximum Product of Two Elements in An Array](https://leetcode.com/problems/maximum-product-of-two-elements-in-an-array/)| [java](./algorithms/maximumProductOfTwoElementsInAnArray/Solution.java) [java_dream](./algorithms/maximumProductOfTwoElementsInAnArray_Dream/maximumProductOfTwoElementsInAnArray_Dream.java)|Easy|
 |1207|[Unique Number of Occurrences](https://leetcode.com/problems/unique-number-of-occurrences/) | [java_dream](./algorithms/uniqueNumberOfOccurrences/uniqueNumberOfOccurrences.java)|Easy|
 |1179|[Reformat Department Table](https://leetcode.com/problems/reformat-department-table/)| [Mysql](./algorithms/reformatDepartmentTable/Solution.sql) |Easy| 

algorithms/concatenationOfArray/Solution.js

@@ -0,0 +1,3 @@
+var getConcatenation = function(nums) {
+    return [...nums, ...nums];
+};