Update readme

Author: sushant097

coding_solutions/Readme.md

@@ -12,4 +12,5 @@ This repository contains my answers to all Leetcode/HackerRank algorithm questio
 | 5 | [First Bad Version](https://leetcode.com/problems/first-bad-version/)| [python3](https://github.com/sushant097/Data-Structure-Algorithms-Collections-Python/blob/master/coding_solutions/interview_related/FirstBadVersion.py) |
 | 6 | [Climbing Stairs](https://leetcode.com/problems/best-time-to-buy-and-sell-stock/)| [python3](https://github.com/sushant097/Data-Structure-Algorithms-Collections-Python/blob/master/coding_solutions/interview_related/[DP]ClimbingStairs.py) |
 | 7 | [Best Time to buy and sell](https://leetcode.com/problems/maximum-subarray/)| [python3](https://github.com/sushant097/Data-Structure-Algorithms-Collections-Python/blob/master/coding_solutions/interview_related/[DP]BestTimeToBuySell.py) |
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+| 8 | [Letter Combinations of a Phone Number](https://leetcode.com/problems/letter-combinations-of-a-phone-number/)| [python3](https://github.com/sushant097/Data-Structure-Algorithms-Collections-Python/blob/master/coding_solutions/interview_related/LetterCombinationOfPhoneNumber.py) |
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