feat: add `dragon-editor` module

[lovefields]

🔗 Linked issue

resolves #1055

❓ Type of change

• [ ] 📖 Documentation (updates to the documentation or readme)
• [ ] 🐞 Bug fix (a non-breaking change that fixes an issue)
• [ ] 👌 Enhancement (improving an existing functionality)
• [x] ✨ New feature (a non-breaking change that adds functionality)
• [ ] 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• [ ] ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

I just made the DragonEditor because I needed the WYSIWYG Editor to write on my blog.

Document Demo

[atinux]

It would be nice to have a playground to see how the editor looks like.

Thank you for contributing to Nuxt :)

[lovefields]

@atinux Oh, Thanks. I added Demo page in document

[lovefields]

@atinux Is someone checking this PR?