Fix: Added a Scroll up button Fix: #1396

[shashankrp]

 know more

Describe your change:

• Add an algorithm?
• [x ] Fix a bug or typo in an existing algorithm?
• Documentation change?

Checklist:

• [x ] I have read CONTRIBUTING.md.
• [ x] This pull request is all my own work -- I have not plagiarized.
• [x ] I know that pull requests will not be merged if they fail the automated tests.
• [ x] This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
• All new JavaScript files are placed inside an existing directory.
• All filenames should use the UpperCamelCase (PascalCase) style. There should be no spaces in filenames.
  Example:UserProfile.js is allowed but userprofile.js,Userprofile.js,user-Profile.js,userProfile.js are not
• All new algorithms have a URL in their comments that points to Wikipedia or another similar explanation.
• If this pull request resolves one or more open issues then the commit message contains Fixes: #{$ISSUE_NO}.

[raklaptudirm]

The readme is hardly large enough to require a scroll-up button. The whole thing fits in my laptop screen.