Add bellman for negative cycle detection

[Mayank29903]

Describe your change:

• Add an algorithm

Added the Bellman-Ford Negative Cycle Detection algorithm in JavaScript.
This algorithm detects if a weighted directed graph contains a negative weight cycle.
It is useful in graph theory and shortest path problems where negative edges may exist.

Checklist:

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized.
• I know that pull requests will not be merged if they fail the automated tests.
• 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.
  Example: https://en.wikipedia.org/wiki/Bellman%E2%80%93Ford_algorithm
• 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.
✅ Project coverage is 85.97%. Comparing base (08d8c6b) to head (8ed970e).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1822      +/-   ##
==========================================
+ Coverage   85.91%   85.97%   +0.05%     
==========================================
  Files         379      381       +2     
  Lines       19778    19851      +73     
  Branches     3015     3033      +18     
==========================================
+ Hits        16993    17066      +73     
  Misses       2785     2785              

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