Added Linked List in C

[khuman-shen]

📋 Pull Request Description and

ISSUE #408

What does this PR add?

• New algorithm implementation
• Data structure implementation
• New programming language support
• Language-specific README
• Bug fix
• Documentation improvement
• Test cases

Data Structure/Feature Details

• Name: Linked List
• Language: C
• Category: Data Structure

Testing

• Code compiles without errors
• All test cases pass
• Edge cases handled
• Documentation updated

Screenshots (if applicable)

Additional Notes

Implemented a simple Linked List with insertAtEnd feature.

[github-actions]

🎉 Welcome to Hacktoberfest 2025, @tanshen-kun! 🎃

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• ✅ Code Validation: Passed
• 🧪 Compilation Tests: Passed

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[github-actions]

🤖 Automated PR Status

🔍 Code Validation

✅ Passed - File naming and structure look good!

🧪 Compilation Tests

✅ Passed - All code compiles successfully!

📋 Overall Status

🎉 Ready for Review - Your PR has passed all automated checks!
👥 Maintainers have been notified for review.

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