Add MLFQScheduler.java new algorithm

[Hardvan]

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized it.
• All filenames are in PascalCase.
• All functions and variable names follow Java naming conventions.
• All new algorithms have a URL in their comments that points to Wikipedia or other similar explanations.
• All new code is formatted with clang-format -i --style=file path/to/your/file.java

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 95.34884% with 2 lines in your changes missing coverage. Please review.

Project coverage is 54.11%. Comparing base (87871ef) to head (667e703).

Files with missing lines	Patch %	Lines
...va/com/thealgorithms/scheduling/MLFQScheduler.java	95.34%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5575      +/-   ##
============================================
+ Coverage     53.96%   54.11%   +0.14%     
- Complexity     3387     3401      +14     
============================================
  Files           535      536       +1     
  Lines         15429    15472      +43     
  Branches       2942     2950       +8     
============================================
+ Hits           8327     8372      +45     
+ Misses         6749     6748       -1     
+ Partials        353      352       -1     

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[siriak]

Looks good, thanks!

[Hardvan]

Thanks!