Added TowerOfHanoi and its test file to recursion

[justanothercoder-hub]

• 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 algorithms include a corresponding test class that validates their functionality.
• 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 79.10%. Comparing base (0e8291e) to head (7e01a6b).

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #7228   +/-   ##
=========================================
  Coverage     79.09%   79.10%           
- Complexity     6973     6976    +3     
=========================================
  Files           783      784    +1     
  Lines         22950    22962   +12     
  Branches       4512     4513    +1     
=========================================
+ Hits          18152    18163   +11     
  Misses         4077     4077           
- Partials        721      722    +1     

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[justanothercoder-hub]

Hello! Just wanted to mention that this is my very first contribution to this repository. I apologize for the messy commit history—I encountered a few learning curves along the way. I am really excited to be contributing here and hope this PR adds value. Thanks for your time and patience