docs: add beginner-friendly quick contribution guide to README(Issue : #465)

[SARTHAKJINDAL1]

📝 Description

Added a beginner-friendly quick contribution guide to the README to help new contributors understand the contribution workflow more easily.

The new section includes:

• Forking the repository
• Cloning the fork
• Creating a branch
• Making changes
• Committing and pushing changes
• Opening a Pull Request

🔗 Linked Issue

Closes #465

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📋 Contribution Checklist

• Only documentation improvements were made.
• Existing repository structure and style were maintained.
• Markdown formatting and readability were improved.
• I have tested the markdown formatting locally.
• GSSoC 2026: I have been assigned to this issue.

[vercel]

@SARTHAKJINDAL1 is attempting to deploy a commit to the Anuj's projects Team on Vercel.

A member of the Team first needs to authorize it.

[SARTHAKJINDAL1]

@steam-bell-92 Sir kindly merge this docs improvement PR.

[steam-bell-92]

@SARTHAKJINDAL1 thanks but we already have that mentioned