Added surface area calculation for pyramid lol

[JoaquinmioFernandez]

• 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 72.26%. Comparing base (474e0de) to head (7e779d5).
Report is 5 commits behind head on master.

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    #6028      +/-   ##
============================================
+ Coverage     71.68%   72.26%   +0.57%     
- Complexity     4946     4955       +9     
============================================
  Files           650      650              
  Lines         17565    17553      -12     
  Branches       3384     3384              
============================================
+ Hits          12592    12684      +92     
+ Misses         4499     4390     -109     
- Partials        474      479       +5     

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[siriak]

Please add JUnit tests

[siriak]

No need in this comment