Create RiemannIntegration.java

[il798li]

This class approximates integrals by using 4 of Riemann's approximation method.

• 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 0% with 32 lines in your changes missing coverage. Please review.

Project coverage is 73.67%. Comparing base (2570a99) to head (5b52fa3).
Report is 6 commits behind head on master.

Files with missing lines	Patch %	Lines
...va/com/thealgorithms/maths/RiemannIntegration.java	0.00%	32 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6215      +/-   ##
============================================
- Coverage     73.78%   73.67%   -0.12%     
- Complexity     5299     5310      +11     
============================================
  Files           671      674       +3     
  Lines         18344    18408      +64     
  Branches       3546     3557      +11     
============================================
+ Hits          13536    13562      +26     
- Misses         4262     4297      +35     
- Partials        546      549       +3     

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