update readme

Author: rishabh1403

README.md

@@ -18,6 +18,8 @@ Solutions of all the questions from Leetcode in JavaScript.
 
 - 167.Two Sum-II - [Question](https://leetcode.com/problems/two-sum-ii-input-array-is-sorted/) | [Source Code](https://github.com/rishabh1403/leetcode-javascript-solutions/blob/master/101-200/167-two-sum-ii.js) | [Blog](https://rishabh1403.com/leetcode-solution-of-two-sum-ii-in-javascript) | [Youtube Video](https://www.youtube.com/watch?v=MjxN8HIzIRc)
 
+- 242.Valid Anagram - [Question](https://leetcode.com/problems/valid-anagram/) | [Source Code](https://github.com/rishabh1403/leetcode-javascript-solutions/blob/master/201-300/268-missing-number.js) | [Blog](https://rishabh1403.com/posts/coding/leetcode/2020/03/leetcode-valid-anagram) | [Youtube Video](https://youtu.be/7z25qqUCOUE)
+
 - 268.Missing Number - [Question](https://leetcode.com/problems/missing-number/) | [Source Code](https://github.com/rishabh1403/leetcode-javascript-solutions/blob/master/201-300/268-missing-number.js) | [Blog](https://rishabh1403.com/posts/coding/leetcode/2020/03/leetcode-missing-number) | [Youtube Video](https://youtu.be/I6AUMvi13fc)
 
 - 771.Jewels and Stones - [Question](https://leetcode.com/problems/jewels-and-stones/) | [Source Code](https://github.com/rishabh1403/leetcode-javascript-solutions/blob/master/701-800/771-jewels-and-stones.js) | [Blog](https://rishabh1403.com/posts/coding/leetcode/2020/03/leetcode-jewels-and-stones) | [Youtube Video](https://youtu.be/cNVJZF5UT1w)