adding TowerOfHanoi.java

[anjumgarg]

• 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 76.45%. Comparing base (b1aa896) to head (1b99bfe).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6716      +/-   ##
============================================
- Coverage     76.45%   76.45%   -0.01%     
- Complexity     5985     5986       +1     
============================================
  Files           716      716              
  Lines         20265    20265              
  Branches       3929     3929              
============================================
- Hits          15494    15493       -1     
- Misses         4180     4181       +1     
  Partials        591      591              

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[DenizAltunkapan]

@anjumgarg Please fix the failing workflows so I can start the review.