Alarm clock in JavaScript

[Sapna2001]

Your checklist for this pull request

⚠️ Please review the guidelines for contributing to this repository.

Parent issue: #375

Type of change

Select all that applies:

• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 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 used consistent code conventions and clear function/method/variable names.
• I have commented on my code, particularly in hard-to-understand areas.
• I have created a helpful and easy to understand README.md which contains description, requirements and use case.
• I have added relevent screenshots/images if necessary in a seperate folder.
• I have added my work in respective language folder.
• My changes generate no new warnings.

❤️ Thank you!

[tejan-singh]

Nice work!