Added palindrome checker using stack

[S-M-J-I]

• 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

All modified and coverable lines are covered by tests ✅

Project coverage is 67.12%. Comparing base (0f8cda9) to head (eab8630).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5887      +/-   ##
============================================
+ Coverage     67.09%   67.12%   +0.03%     
- Complexity     4557     4560       +3     
============================================
  Files           618      619       +1     
  Lines         17085    17098      +13     
  Branches       3294     3296       +2     
============================================
+ Hits          11463    11477      +14     
+ Misses         5167     5166       -1     
  Partials        455      455              

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