Create AVLTree.js

[vishantrathi]

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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 80 lines in your changes missing coverage. Please review.

Project coverage is 84.42%. Comparing base (ff314a2) to head (83945de).

Files with missing lines	Patch %	Lines
AVLTree.js	0.00%	80 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1732      +/-   ##
==========================================
- Coverage   84.76%   84.42%   -0.35%     
==========================================
  Files         378      379       +1     
  Lines       19742    19822      +80     
  Branches     2955     2957       +2     
==========================================
  Hits        16735    16735              
- Misses       3007     3087      +80     

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[appgurueu]

https://github.com/TheAlgorithms/JavaScript/blob/master/Data-Structures/Tree/AVLTree.js