Added surface area calculation for pyramid

[amusheruoG]

Implemented a surface area method for a pyramid in
src/main/java/com/thealgorithms/maths/Area.java

Course: ENGG4450
Lab: 6 - Code Review

[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 (67b957c).

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    #6917      +/-   ##
============================================
- 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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