longest palindromic substring . leetcode Q5

[Rishabhraghwendra18]

Pull Request Template

Question number - 5

Issue no.(must) - #5

Self Check(Tick After Making pull Request)

• [ ] This issue was assigned to me.
• [ x ] One Change in one Pull Request
• [ x ] My file is in proper folder (Name of folder should be Question number) (E.g. 120)
• [ x ] I am following clean code and Documentation and my code is well linted with flake8.
• [ x ] I have added README.md (With question description)
• [ x ] I have added sufficient comments in my code

If issue was not assigned to you Please don't make a PR. It will marked as invalid.