[FEAT]: Implement husky and update contribution guide for commit linting

[AshutoshDash1999]

Pull Request Template

What type of change is this?

• Bug fix
• Feature
• Docs
• Chore

Related issue

Closes #109

Changes made

• Implement Husky for commit linting
• Enforce conventional commits

How to test

1. Write a bad commit message and push (it will be reject)
2. Write a good commit message and push (it will be accepted)

Checklist

• Code follows ESLint rules (npm run lint passes)
• Code formatted with Prettier (npm run format)
• No API keys or secrets in code
• README updated if needed
• Tested locally in Chrome extension