CAPTCHA Generator

# Description

Make a unique **_CAPTCHA_** (Completely Automated Public Turing test to tell Computers and Humans Apart) every time and ask the user to enter the same CAPTCHA within 10 seconds and checking the user input with the generated CAPTCHA.

If the user exceeds _**10 seconds**_ it generates a warning and presents the user with a new CAPTCHA otherwise validate the user as human.
Identify the user as not human after the 2nd warning.

## Language

- [x] C++
- [x] PHP
- [x] Python
- [x] Java
- [ ] Other (Please specify)

## Type of issue

- [x] Feature
- [ ] Bug

The checklist will be updated by the maintainers / author of this issue according to the language in which snippets are added or are proposed to be added.