added time and space complexity as a comment at the top of thef ile

Author: kx0101

typescript/0295-find-median-from-data-stream.ts

@@ -1,3 +1,8 @@
+/*
+    * Time Complexity: O(logn)
+    * Space Complexity: O(n)
+*/
+
 class MedianFinder {
     public minHeap;
     public maxHeap;