feat: adds typescript file

solution to LeetCode 1929 is included

Author: AmiyahJo

lesson_11/arrays_java/arrays_app/src/main/java/com/codedifferently/lesson11/Lesson11.ts

@@ -0,0 +1,16 @@
+/**
+* Provide the solution to LeetCode 1929 here:
+* https://leetcode.com/problems/concatenation-of-array
+*/
+
+function getConcatenation(nums: number[]): number[] {
+    let n: number = nums.length;
+    let ans: number[] = new Array(2*n);
+    
+     for(let i = 0; i < n; i++){
+        ans[i] = nums[i];
+        ans[i + n] = nums[i];
+       }
+
+    return ans;
+};