feat(add): add layer template

[clemcode]

❓ 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)
• ✨ 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

This PR adds the layer template to the add command. This creates a directory of <name> with a base nuxt.config.ts file.

# Generates `layers/subscribe/nuxt.config.ts`
npx nuxi add layer subscribe

A PR with the documentation update is ready to be open here : https://github.com/clemcode/nuxt/tree/docs/nuxi/add-layer

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 28.57143% with 5 lines in your changes missing coverage. Please review.

Please upload report for BASE (main@a433fbc). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
src/utils/templates.ts	28.57%	5 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff           @@
##             main    #626   +/-   ##
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  Coverage        ?   1.37%           
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  Files           ?      44           
  Lines           ?    2905           
  Branches        ?      44           
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  Hits            ?      40           
  Misses          ?    2824           
  Partials        ?      41           

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[danielroe]

nice work on this and #630! ❤️