Update README.md

Signed-off-by: Nikolay Dubina <nikolay.dubina.pub@gmail.com>

Author: nikolaydubina

README.md

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 ## 🫐 htmljson: rich rendering of JSON as HTML in Go
 
+<p align="center">
+  ✨ Sponsored by <a href="https://apps.apple.com/app/id6738306589">NDX AI Shopping Assistant</a>
+</p>
+
 [![codecov](https://codecov.io/gh/nikolaydubina/htmljson/branch/master/graph/badge.svg?token=yXmNdIDn8O)](https://codecov.io/gh/nikolaydubina/htmljson)
 [![Go Report Card](https://goreportcard.com/badge/github.com/nikolaydubina/htmljson)](https://goreportcard.com/report/github.com/nikolaydubina/htmljson)
 [![Go Reference](https://pkg.go.dev/badge/github.com/nikolaydubina/htmljson.svg)](https://pkg.go.dev/github.com/nikolaydubina/htmljson)