Create TowerOfHanoi.java

[monubucky]

• 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.
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• All new code is formatted with clang-format -i --style=file path/to/your/file.java

[vil02]

This already exists: TowerOfHanoi.java.

Feel free, to cleanup the existing implementation by:

• removing the print statements,
• removing the main method,
• adding proper junit tests.