feat: Add GaleShapley in a new folder Greedy

[BKarthik7]

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Describe your change:

• [x] Add an algorithm?
• [x] 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 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.

[codecov-commenter]

Codecov Report

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

Project coverage is 84.71%. Comparing base (5b17ea1) to head (43b1f01).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1714      +/-   ##
==========================================
+ Coverage   84.65%   84.71%   +0.06%     
==========================================
  Files         378      379       +1     
  Lines       19744    19822      +78     
  Branches     2952     2957       +5     
==========================================
+ Hits        16715    16793      +78     
  Misses       3029     3029              

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[BKarthik7]

@raklaptudirm can you please review