Add WordPatternMatcher.java new algorithm

[Hardvan]

• 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

Attention: Patch coverage is 91.66667% with 2 lines in your changes missing coverage. Please review.

Project coverage is 54.80%. Comparing base (f34fe4d) to head (d9e1434).
Report is 6 commits behind head on master.

Files with missing lines	Patch %	Lines
...thealgorithms/backtracking/WordPatternMatcher.java	91.66%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5627      +/-   ##
============================================
+ Coverage     54.56%   54.80%   +0.24%     
- Complexity     3413     3464      +51     
============================================
  Files           535      539       +4     
  Lines         15383    15607     +224     
  Branches       2935     2967      +32     
============================================
+ Hits           8393     8554     +161     
- Misses         6637     6695      +58     
- Partials        353      358       +5     

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