Create BestTimeToBuyAndSellStock2.js

[shail-patel-321]

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Describe your change:

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

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.
• If this pull request resolves one or more open issues then the commit message contains Fixes: #{$ISSUE_NO}.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 27 lines in your changes missing coverage. Please review.

Project coverage is 84.64%. Comparing base (55ff0ad) to head (9528b0d).
Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
Dynamic-Programming/BestTimeToBuyAndSellStock2.js	0.00%	27 Missing ⚠️

Additional details and impacted files

@@ Coverage Diff @@ ## master #1755 +/- ## ========================================== - Coverage 84.76% 84.64% -0.12%  ========================================== Files 378 379 +1 Lines 19738 19765 +27 Branches 2957 2958 +1 ========================================== Hits 16731 16731 - Misses 3007 3034 +27 

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