28. Find the Index of the First Occurrence in a String README.md

[fannydai]

Problem 28 readme is not generating

To Reproduce
Steps to reproduce the behavior:
Submit working code for question 28 on leetcode, submit problem
https://leetcode.com/problems/find-the-index-of-the-first-occurrence-in-a-string/

class Solution {
public int strStr(String haystack, String needle) {
return haystack.indexOf(needle);
}
}