Added surface area calculation for pyramid

[yalchach]

• 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

[yalchach]

Good addition — code follows the same structure as other methods!”

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.04%. Comparing base (48ba1ae) to head (840448a).

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    #6919      +/-   ##
============================================
- Coverage     78.05%   78.04%   -0.02%     
- Complexity     6466     6467       +1     
============================================
  Files           738      738              
  Lines         21585    21592       +7     
  Branches       4220     4221       +1     
============================================
+ Hits          16849    16851       +2     
- Misses         4064     4070       +6     
+ Partials        672      671       -1     

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