Update README.md

Author: aswanidutt93

README.md

@@ -5,3 +5,7 @@ This is repository for Leetcode may challenge solution in c sharp. [challenge li
 1. [First Bad Version](https://leetcode.com/explore/challenge/card/may-leetcoding-challenge/534/week-1-may-1st-may-7th/3316/)
 2. [Jewels and stones](https://leetcode.com/explore/challenge/card/may-leetcoding-challenge/534/week-1-may-1st-may-7th/3317/)
 3. [Ransom Note](https://leetcode.com/explore/challenge/card/may-leetcoding-challenge/534/week-1-may-1st-may-7th/3318/)
+4. [Numbers Complement](https://leetcode.com/explore/challenge/card/may-leetcoding-challenge/534/week-1-may-1st-may-7th/3319/)
+5. [First Unique character](https://leetcode.com/explore/challenge/card/may-leetcoding-challenge/534/week-1-may-1st-may-7th/3320/)
+6. [Majority Element](https://leetcode.com/explore/challenge/card/may-leetcoding-challenge/534/week-1-may-1st-may-7th/3321/)
+7.