Create basicBankingSystem.java

[nikhilgupta0]

• [x] I have read CONTRIBUTING.md.
• [x] This pull request is all my own work -- I have not plagiarized it.
• [x] All filenames are in PascalCase.
• [x] All functions and variable names follow Java naming conventions.
• [x] All new algorithms have a URL in their comments that points to Wikipedia or other similar explanations.
• [x] 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 :white_check_mark:

Project coverage is 66.72%. Comparing base (2a518e3) to head (248a4f9).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5854      +/-   ##
============================================
+ Coverage     66.70%   66.72%   +0.01%     
- Complexity     4482     4484       +2     
============================================
  Files           608      608              
  Lines         16913    16913              
  Branches       3264     3264              
============================================
+ Hits          11282    11285       +3     
+ Misses         5182     5181       -1     
+ Partials        449      447       -2     

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[siriak]

It's not a well-known algorithm