improve README examples of constants/time namespace

[uditrajput03]

Resolves #1562

Description

What is the purpose of this pull request?

This pull request:

• Add examples of the functions present in constant/time namespace and their usage.
• Adds example demonstration in the README.
• Adds the same demonstration example in examples/index.js

Related Issues

Does this pull request have any related issues?

This pull request:

• resolves [RFC]: improve README examples of constants/time namespace #1562

Questions

Any questions for reviewers of this pull request?

No.

Other

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No.

Checklist

Please ensure the following tasks are completed before submitting this pull request.

• Read, understood, and followed the contributing guidelines.

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@stdlib-js/reviewers

[stdlib-bot]

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[stdlib-bot]

Thank you for working on this pull request. However, we cannot accept your contribution as this pull request does not follow project conventions.

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