Update README.md

We are so back

Author: CursedSpiderBoi

README.md

@@ -16,6 +16,7 @@ Original Approach
 |[Roman To Interger](https://leetcode.com/problems/roman-to-integer/)|  | HashTable, Math, String
 |[Letter Combinations of a Phone Number](https://leetcode.com/problems/letter-combinations-of-a-phone-number/)| | HashTable, Math, Backtracking
 | [Valid Parentheses](https://leetcode.com/problems/valid-parentheses/)|  | String, Stack
+| [Island Perimeter](https://leetcode.com/problems/island-perimeter/description/)|  | Array, Depth-First Search, Breadth-First Search, Matrix
 
 
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