Added surface area calculation for pyramid

[JonathanButterworth]

• 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

❌ Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.33%. Comparing base (bb6385e) to head (efae5bc).

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    #6853      +/-   ##
============================================
- Coverage     78.35%   78.33%   -0.02%     
- Complexity     6615     6616       +1     
============================================
  Files           746      746              
  Lines         22015    22022       +7     
  Branches       4320     4321       +1     
============================================
+ Hits          17249    17252       +3     
- Misses         4078     4084       +6     
+ Partials        688      686       -2     

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[JonathanButterworth]

This is a push request for the ENGG*4450 Large Scale Software Architectural Engineering Class' Lab 6.

[DenizAltunkapan]

@JonathanButterworth Thank you for your contribution!