Add “Learn More” section to Litmus Introduction doc

[PriteshKiri]

Description
The Litmus Introduction documentation currently lacks a Learn More section to guide users to related resources.

Location
website/docs/introduction/what-is-litmus.md→ End of the document

Proposed changes
Add a new Learn More section at the end of the doc with the following links:

Learn more
• Install Litmus
• Usecases of Litmus
• Core Principles
• Join our Community

Ensure formatting and styling are consistent with other Learn More sections in the docs - Reference

[hakimlutfi46]

Hello 👋, I’m interested in working on this issue. Could you assign it to me?

[Devansh422]

Hello! I am a Frontend Developer
i would love to work on this issue

looking forward to get assigned for this issue

[somdipto]

Hello, I'm interested in contributing to LitmusChaos for Hacktoberfest and would Like to take on this issue.

I've reviewed the issue details and understand that a "Learn More" section needs to be added to the end of the Litmus introduction document.

By plan to resolve this is as follows:

1. I will open the website/docs/introduction/what-is-litmus.md file.

2. At the end of the file, I will add a new section with the heading "Learn More".

3. I will then add the list of specified links to this new section.

4. I will check the provided reference to ensure the formatting and styling are consistent with other "Learn More" sections in the documentation.

5. After making the changes, I will submit a pull request.

Could you please assign this issue to me? I'm looking forward to contributing.

@PriteshKiri