Added BasicPrefixSum algorithm and tests

[mbatwc113114]

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Describe your change:

• [x] Add an algorithm?

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.
• [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.
• [ ] 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 94.44444% with 2 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 85.89%. Comparing base (1d252d7) to head (58e4801).

Files with missing lines	Patch %	Lines
Recursive/SubsequenceRecursive.js	0.00%	2 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1786      +/-   ##
==========================================
+ Coverage   85.87%   85.89%   +0.01%     
==========================================
  Files         377      378       +1     
  Lines       19720    19747      +27     
  Branches     3005     3007       +2     
==========================================
+ Hits        16935    16962      +27     
  Misses       2785     2785              

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