Add Boyer-Moore algorithm and JUnit test

[PauLopNun]

• 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 74.10%. Comparing base (7602f1e) to head (53885db).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6272      +/-   ##
============================================
+ Coverage     74.07%   74.10%   +0.03%     
- Complexity     5351     5361      +10     
============================================
  Files           677      678       +1     
  Lines         18648    18673      +25     
  Branches       3621     3627       +6     
============================================
+ Hits          13813    13838      +25     
  Misses         4276     4276              
  Partials        559      559              

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