Algorithm to calculate the Arithmetic Geometric Mean

[Rudxain]

Added an algorithm to compute/find the Arithmetic-Geometric Mean between 2 numbers a and g. I thought it would be a good idea since it shows how to compute at full precision without an epsilon comparison, and there's already an Arithmetic Mean so I added this for completeness.

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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 its comments that points to Wikipedia or other similar explanation.
• If this pull request resolves one or more open issues then the commit message contains Fixes: #{$ISSUE_NO}.

[raklaptudirm]

Please add tests for the algorithm.

[Rudxain]

Please add tests for the algorithm.

I committed the test script now, but the "build" stage says that none of the methods are functions. "toBe is not a function", and "toEqual is not a function". Is this normal?

[raklaptudirm]

toBe should be outside expect. Please fix all the instances where you put it inside.

[Rudxain]

My bad, sorry. I didn't notice. I'll fix it now

[Rudxain]

I'll fix the other bugs now