Adding a file

[ManasBhilare]

Pull Request Template

14 - Longest-common-prefix -

Issue no.(must) - #16

Self Check(Tick After Making pull Request)

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