adds comments in min cost climbing stairs

Author: anishLearnsToCode

src/MinCostClimbingStairs.java

@@ -1,3 +1,7 @@
+// https://leetcode.com/problems/min-cost-climbing-stairs
+// T: O(n)
+// S: O(1)
+
 public class MinCostClimbingStairs {
     public int minCostClimbingStairs(int[] cost) {
         int currentCost = cost[1], previousCost = cost[0], temp;