Feature: Absolute value Algorithm

[RicardoRibeiroRodrigues]

Summary of the Change:
This pull request introduces the Absolute algorithm, a simple and efficient way to calculate the absolute value of a number in C#.

Motivation:
I wanted to make my first Open Source contribution and noticed that the Absolute algorithm was implemented in other programming languages but not in C#, so I wanted to add this functionality to the project.

• [ X ] I have performed a self-review of my code
• [ X ] My code follows the style guidelines of this project
• [ X ] I have added tests that prove my fix is effective or that my feature works
• [ X ] New and existing unit tests pass locally with my changes
• [ X ] Comments in areas I changed are up to date
• [ X ] I have added comments to hard-to-understand areas of my code
• [ X ] I have made corresponding changes to the README.md

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.94%. Comparing base (6fce1f5) to head (3911745).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #462      +/-   ##
==========================================
+ Coverage   94.92%   94.94%   +0.01%     
==========================================
  Files         237      238       +1     
  Lines       10058    10091      +33     
  Branches     1422     1429       +7     
==========================================
+ Hits         9548     9581      +33     
  Misses        392      392              
  Partials      118      118              

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[siriak]

The code looks good, but you need to improve coverage with tests, see Codacy report

[RicardoRibeiroRodrigues]

Thank you for your review! I believe my latest commits should address the test coverage issue.

[siriak]

Looks good, thanks!