ADDED TWO ARRAY PROGRAMS

[VeeruYadav45]

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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

:x: Patch coverage is 0% with 26 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 85.80%. Comparing base (08d8c6b) to head (ea79066).

Files with missing lines	Patch %	Lines
Data-Structures/Array/leadersinarray.js	0.00%	16 Missing :warning:
...ata-Structures/Array/test/checkarraysortedornot.js	0.00%	10 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1836      +/-   ##
==========================================
- Coverage   85.91%   85.80%   -0.12%     
==========================================
  Files         379      381       +2     
  Lines       19778    19804      +26     
  Branches     3015     3017       +2     
==========================================
  Hits        16993    16993              
- Misses       2785     2811      +26     

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