feat : Added Open Source Contribution Study Resources in the coding section

[arpitavbhosale]

🧑‍💻 Contributor Details

Name: Arpita Bhosale

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🔍 Issue Link

Related to: #Added Open Source Contribution Study Resources

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📝 What’s Changed?

This PR adds useful study resource links for open source contributors, such as HackerRank and similar platforms, to help beginners and developers practice coding and problem-solving.
Changes Made:
Added links to open-source contribution study resources.
Included HackerRank as a reference for coding practice.
Why this is useful:
Supports beginners in preparing for open source contributions effectively.

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📸 Visual Changes (if any)

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✅ Pre-Merge Checklist

• I’ve linked this PR to a valid, assigned issue.
• I created a dedicated branch (not main) for these changes.
• Changes were tested locally and work as expected.
• Code follows the style guidelines in the project.
• No merge conflicts exist.
• Confirmed that the feature fits well with the latest updated version of the website.
• Layout is responsive on desktop & mobile devices.

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💡 Notes for Reviewers (optional)

Add any extra details, considerations, or special instructions for testing.

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[arpitavbhosale]

Please review the changes at your convenience and let me know if any changes to do.

Thank you for maintaining this project!

[Varshitha713]

@arpitavbhosale please mention the issue number!

[arpitavbhosale]

Hi, I added new study resources directly without linking to any issue. Would you like me to create a new issue for this contribution and then update the PR with the issue number?

<div class="card fade-in" category="learning">
  <h4>Coding challenges: skill assessment</h4>
  <p>HackerRank is an online platform for coding practice and competitive programming. It offers a wide range of
     challenges across various domains like algorithms, data structures, and AI.</p>
  <a href="https://www.hackerrank.com/" target="_blank">Explore HackerRank</a>
</div>   like this!

pls let me know how I can contribute better to this repo.

[Varshitha713]

Hey @arpitavbhosale hackerrank exists in the site please add new resources and will be better if it's more than 1!!