Add Docstring in the Caesar Cipher file

[Gabriela20103967]

Description

In this issue, I want to add docstrings to the function in the Caesar Cipher code. The purpose is to have a clear and well documented code that will help us to understand it better.

Type of issue

• Feature (New Script)
• Bug
• Documentation

Checklist:

• I have read the project guidelines.
• I have checked previous issues to avoid duplicates.
• This issue will be meaningful for the project.

Details

The functions in the Caesar Cipher code currently lack docstrings. We need to add detailed docstrings to explain:

• The purpose of each function.
• The parameters each function, including their types and descriptions.
• The return values, including their types and descriptions.