Fixed Spelling Error in README.md

[HibouDevv]

🔗 Linked issue

There is a spelling error in README.md.

❓ Type of change

I fixed it, because it said nuxi, and I changed it to nuxt.

📚 Description

It helps users to use nuxt-tailwind without any errors.

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Name	Link
🔨 Latest commit	8b3adccf1208cbfb16a2b551502b02760965a92b

[what-the-diff[bot]]

PR Summary

• Updated README Command The command listed in our README, the instruction guide for our software, has been corrected. This should enhance user experience by guiding them to use the right command to add Tailwind CSS, a tool which helps in the visual design of our application.