Added volume of a pyramid frustum

[kvadrik]

Added a function calculating volume of a pyramid frustum, V=(S1+S2+sqrt(S1*S2))*h/3

• 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 algorithms include a corresponding test class that validates their functionality.
• 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 79.40%. Comparing base (7e5d9d4) to head (166dbe4).

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #7291   +/-   ##
=========================================
  Coverage     79.40%   79.40%           
- Complexity     7046     7049    +3     
=========================================
  Files           787      787           
  Lines         23105    23106    +1     
  Branches       4542     4542           
=========================================
+ Hits          18346    18347    +1     
- Misses         4023     4024    +1     
+ Partials        736      735    -1     

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