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 73.66%. Comparing base (2570a99) to head (49ae0ea).

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%   73.66%   -0.13%     
  Complexity     5299     5299              
============================================
  Files           671      672       +1     
  Lines         18344    18376      +32     
  Branches       3546     3550       +4     
============================================
  Hits          13536    13536              
- Misses         4262     4294      +32     
  Partials        546      546              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.