Update README.md file (Siddharth Pradeep / thirt33n / Mail-Checker Project)

[AAdewunmi]

Description

Add README.md with detailed guidance for the project description, setup and demo output.

Fixes #(34) Project #28 does not follow repo guidance.

* Not having a specific folder for the new project.
Project #28 does not follow repo guidance. Specifically:
    Not having README.md with detailed guidance for the project description, setup and demo output.

• [ ] Issue_no: <insert your issue no here>
• [ ] Not applicable

Type of change

Choosing one or more options from the following as per the nature of your Pull request.

• [ ] New project insert
• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [x] Documentation Update

Project

• Your Project Name:

• Short Description: Provide a short desctiption of your Python project

Checklist:

Please tick all the boxes that are fulfilled by your Pull Request.

• [ ] I have named my files and folder, according to this project's guidelines.
• [ ] My code follows the style guidelines of this project.
• [ ] I have commented on my code, particularly in hard-to-understand areas.
• [x] I have created a helpful and easy to understand README.md, according to the given README_TEMPLATE.
• [x] My changes do not produce any warnings.