added typing speed

[Sha-mbhavi]

close #4385

📋 Description

A Typing Speed Tester is a tool that measures how fast and accurately a person can type on a keyboard, usually calculated in words per minute (WPM). It shows a text for the user to type and then evaluates typing speed, accuracy, and errors

📝 Type of Change

• 🆕 New Project - Adding a new project to OpenPlayground
• 🐛 Bug Fix - Non-breaking fix for an issue
• ✨ Enhancement - Improvement to existing functionality
• 📚 Documentation - Updates to README, comments, or docs
• 🎨 Style - UI/CSS improvements (no functionality change)

📸 Screenshots

✅ Checklist

For All PRs

• I have read the CONTRIBUTING.md guidelines
• I have tested my changes locally
• I have included screenshots of my changes
• My code follows the project's coding style
• I have NOT modified any files unrelated to my change

For New Projects

• I created my project in /projects/my-project-name/ folder
• My project has an index.html file as the entry point
• I added my project entry to projects.json (NOT index.html)
• I tested that my project card displays correctly
• My project is responsive and works on mobile

For Bug Fixes / Enhancements

• My changes ONLY address the specific issue mentioned
• I have NOT added any "bonus" features or unrelated changes
• I properly tested the fix/enhancement

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⚠️ IMPORTANT RULES

🚨 PRs will be CLOSED WITHOUT REVIEW if they:

1. ❌ Modify files unrelated to the issue being solved
2. ❌ Add "bonus" features or changes not requested
3. ❌ Touch index.html for adding projects (use projects.json instead)
4. ❌ Include AI-generated code that hasn't been reviewed
5. ❌ Don't include screenshots
6. ❌ Have merge conflicts

Please respect maintainer time. Stick to ONLY what the issue asks for.

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🧪 Testing

• Tested on Chrome
• Tested on Firefox
• Tested on Mobile (responsive)
• No console errors

[github-actions]

🎉 Thanks for the PR, @Sha-mbhavi!

We really appreciate you taking the time to contribute to OpenPlayground! 💙

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Please give us a star! It helps the project grow and reach more developers! 🌟

🔗 https://github.com/YadavAkhileshh/OpenPlayground

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✅ PR Checklist

Before we review, please ensure:

• Your code follows the project's coding standards
• All file changes are accurate and intentional
• You've tested your changes locally
• Any review comments have been addressed

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We'll review your PR as soon as possible. Keep up the great work! ✨

[Sha-mbhavi]

@YadavAkhileshh Kindly merge this PR.