Implement Rabin-Karp algorithm

[yanurag1414]

• 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 27 lines in your changes are missing coverage. Please review.

Project coverage is 38.50%. Comparing base (8be8b95) to head (08899fa).

Files	Patch %	Lines
.../com/thealgorithms/strings/RabinKarpAlgorithm.java	0.00%	27 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5171      +/-   ##
============================================
- Coverage     38.58%   38.50%   -0.09%     
  Complexity     2378     2378              
============================================
  Files           516      517       +1     
  Lines         15313    15340      +27     
  Branches       2957     2966       +9     
============================================
- Hits           5908     5906       -2     
- Misses         9120     9148      +28     
- Partials        285      286       +1     

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[BamaCharanChhandogi]

This algo is already implemented here