updated the README

Author: mehediislamripon

README.md

@@ -26,4 +26,5 @@
 | Problem - 22 | Check the number is Palindrome or not |
 | Problem - 23 | Create a function that receives a string "abcbdbd", and returns an array like: ["a", "a.b", "a.b.c", "a.b.c.b", "a.b.c.b.d", "a.b.c.b.d.b", ...] |
 | Problem - 24 | Find your crushes phone number |
+| Problem - 25 | Plus One - 66.LeetCode - Easy |
 <!-- | Problem - 22 | | -->