Added Ford Fulkerson algorithm for Hacktoberfest contribution

[Sameeksha-12]

 know more

Describe your change:

• [x] Add an algorithm?
• [ ] 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.
• [x] All new JavaScript files are placed inside an existing directory.
• [x] 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
• [x] All new algorithms have a URL in their comments that points to Wikipedia or another similar explanation.
• [x] If this pull request resolves one or more open issues then the commit message contains Fixes: #{$ISSUE_NO}.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 84.69%. Comparing base (9010481) to head (ea28f4b).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1708      +/-   ##
==========================================
+ Coverage   84.65%   84.69%   +0.03%     
==========================================
  Files         378      379       +1     
  Lines       19744    19795      +51     
  Branches     2951     2965      +14     
==========================================
+ Hits        16715    16766      +51     
  Misses       3029     3029              

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.