added surface area calculation for pyramid

[Hadis-mrd]

• 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 0% with 7 lines in your changes missing coverage. Please review.

Project coverage is 66.76%. Comparing base (33dee07) to head (c4c9419).

Files with missing lines	Patch %	Lines
src/main/java/com/thealgorithms/maths/Area.java	0.00%	7 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5878      +/-   ##
============================================
- Coverage     66.81%   66.76%   -0.06%     
+ Complexity     4501     4500       -1     
============================================
  Files           611      611              
  Lines         16958    16965       +7     
  Branches       3275     3276       +1     
============================================
- Hits          11330    11326       -4     
- Misses         5181     5190       +9     
- Partials        447      449       +2     

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