Added Captcha Generator

[ulixius9]

Description

Added Captcha Genrator mini project

Type of change

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

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.
• [✓ ] My Pull Request has a descriptive title. (not a vague title like Update index.md)
• [ ✓] I have commented on my code, particularly in hard-to-understand areas.
• [ ✓] I have created a helpful and easy to understand README.md, according to the given README_TEMPLATE.
• [ ✓] I have included a requirements.txt file (if external libraries are required.)
• [ ✓] My changes do not produce any warnings.
• [ ✓] I have added a working sample/screenshot of the script.