Added another method to find kth number

[TaranjeetSinghKalsi]

Added another method to find kth number using max-heap(Priority Queue). Also added test cases.

• 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 70.46%. Comparing base (871e4df) to head (d36f31a).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5918      +/-   ##
============================================
+ Coverage     70.44%   70.46%   +0.01%     
- Complexity     4803     4808       +5     
============================================
  Files           642      642              
  Lines         17403    17412       +9     
  Branches       3349     3351       +2     
============================================
+ Hits          12260    12269       +9     
  Misses         4681     4681              
  Partials        462      462              

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