Update README.md

Author: Achal-Hingrajiya

README.md

@@ -7,3 +7,4 @@ This repo contains solutions of programming problems of January Challenge
 | 11th Jan, 2022 | [1022. Sum of Root To Leaf Binary Numbers](https://leetcode.com/problems/sum-of-root-to-leaf-binary-numbers/) | [Here](https://github.com/Achal-Hingrajiya/Leetcode_January_Challenge/tree/main/1022_Sum%20of%20Root%20To%20Leaf%20Binary%20Numbers_(11th%20Jan%202022)) |
 | 12th Jan, 2022 | [701. Insert into a Binary Search Tree](https://leetcode.com/problems/insert-into-a-binary-search-tree/) | [Here](701_Insert%20into%20a%20Binary%20Search%20Tree_(12th%20Jan%202022)) |
 | 13th Jan, 2022 | [452. Minimum Number of Arrows to Burst Balloons](https://leetcode.com/problems/minimum-number-of-arrows-to-burst-balloons/) | [Here](452_Minimum%20Number%20of%20Arrows%20to%20Burst%20Balloons_(13th%20Jan%2C%202022)) |
+| 14th Jan, 2022 | [8. String to Integer (atoi)](https://leetcode.com/problems/string-to-integer-atoi/) | [Here](8_String%20to%20Integer%20(atoi)_(14th%20Jan%202022)) |