Adding Monte Carlo's Integral Approximation

[MuhammadEzzatHBK]

• 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

All modified and coverable lines are covered by tests ✅

Project coverage is 73.91%. Comparing base (c02074e) to head (9dba2d8).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6235      +/-   ##
============================================
+ Coverage     73.89%   73.91%   +0.01%     
- Complexity     5314     5327      +13     
============================================
  Files           674      675       +1     
  Lines         18438    18452      +14     
  Branches       3568     3572       +4     
============================================
+ Hits          13625    13638      +13     
- Misses         4264     4265       +1     
  Partials        549      549              

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[DenizAltunkapan]

Looks very good. Thank you for contributing :)