Added Rectangle.js and Rectangle.test.js to "Geometry" and it's "test" Directories

[debnath003]

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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}.

[debnath003]

@appgurueu @raklaptudirm please approve this PR and merge this so that it can be eligible for hacktoberfest

[debnath003]

@appgurueu @raklaptudirm please check my PR #1413 and approve for hacktoberfest

[appgurueu]

Sorry, but this is trivial. I don't see any algorithmic value yet.

[debnath003]

Can I update the comment? @appgurueu

[appgurueu]

Can I update the comment? @appgurueu

This is not about a comment, this is about the contents of this PR (adding a trivial rectangle class with area / perimeter functions) which I don't see adding much value. To quote the contribution guidelines:

[...] each algorithm in this repo should add a unique value

(note: we'll try to make it more clear in the future what our expectations are, and that we mostly aren't interested in trivial algorithms; if in doubt, open an issue before working on an implementation)