Update README.md

スポンサーとして NuxtLabs Japan を追記

Author: k-miyake

README.md

@@ -4,3 +4,4 @@ This repository is a clone of https://github.com/nuxt/learn.nuxt.com and is a Ja
 Some of the content will be created in Japanese before the original.\
 We have received permission from [@antfu](https://github.com/antfu).\
 Special thanks to [@antfu](https://github.com/antfu) 💚
+This repository is sponsored by [NuxtLabs Japan](https://zenadvisor.io/nuxtlabs-japan).