Add Floor numeric algorithm

[Paulofalcao2002]

Summary of the Change:

This pull request introduces the Floor algorithm, which performs the floor operation on a number. Reference

Motivation

Similar to #490, I wanted to include this algorithm since it is present in other languages repositories, such as python.

• [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[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.14%. Comparing base (5239e71) to head (7a4f1f6). Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #493 +/- ## ======================================= Coverage 95.13% 95.14% ======================================= Files 262 263 +1 Lines 10799 10803 +4 Branches 1517 1518 +1 ======================================= + Hits 10274 10278 +4 Misses 400 400 Partials 125 125 ```

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