Create FourSumProblem.java

[Krushit-Babariya]

• 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 23 lines in your changes missing coverage. Please review.

Project coverage is 66.68%. Comparing base (e499d3b) to head (b01bbf1).

Files with missing lines	Patch %	Lines
...in/java/com/thealgorithms/misc/FourSumProblem.java	0.00%	23 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5896      +/-   ##
============================================
- Coverage     66.80%   66.68%   -0.12%     
+ Complexity     4501     4498       -3     
============================================
  Files           611      612       +1     
  Lines         16958    16981      +23     
  Branches       3275     3284       +9     
============================================
- Hits          11328    11324       -4     
- Misses         5182     5206      +24     
- Partials        448      451       +3     

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