Add PrimeCheck algorithm in Java

[manikonda-anjali]

Implemented a simple algorithm in Java to check whether a number is prime or not.

• Added a new file: PrimeCheck.java in src/main/java/com/thealgorithms/math/
• The program defines a function isPrime(int n) that checks for primality.
• Included a main method to test the function with sample input.

This implementation follows Java naming conventions and contributes to the Math algorithms section.

• 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

❌ Patch coverage is 0% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.32%. Comparing base (bb6385e) to head (3819941).

Files with missing lines	Patch %	Lines
...c/main/java/com/thealgorithms/math/PrimeCheck.java	0.00%	10 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6993      +/-   ##
============================================
- Coverage     78.35%   78.32%   -0.04%     
- Complexity     6615     6616       +1     
============================================
  Files           746      747       +1     
  Lines         22015    22025      +10     
  Branches       4320     4323       +3     
============================================
+ Hits          17249    17250       +1     
- Misses         4078     4088      +10     
+ Partials        688      687       -1     

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