Add Length Conversion

[0APOCALYPSE0]

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Feature

I have added Algorithms for Length Conversion.
Issue #1391

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}.

[appgurueu]

I don't think this is interesting enough algorithmically yet; the code also suffers from unnecessary code duplication: You've effectively hardcoded the cartesian product of {mile, kilometer, meter, centimeter, feet, yard, inch} with itself (and excepting self-to-self, of course).

I think you should change your function to be something like function LengthConversion(length, fromUnit, toUnit) where fromUnit and toUnit are standard abbreviations like km for kilometre or similar. Then you should use a lookup dict which maps these to meters. The calculation then becomes length * meters[fromUnit] / meters[toUnit], and you get away with a fraction of the code.

[0APOCALYPSE0]

@appgurueu I have updated. Could you please review it now?
Thanks

[appgurueu]

Great, now please