Added Carousel in Vanilla JS

[kiruba-r11]

Description

A carousel is a slideshow for cycling through series of contents. This can be used for testimonials, reviews section etc.

Fixes #58

Type of change

Please delete options that are not relevant.

• This change requires a documentation update

Checklist:

• My code follows the style guidelines(Clean Code) of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests/screenshots(if any) that prove my fix is effective or that my feature works

[Ayush7614]

@kiruba-r11 Resolve Conflict