Update README.md

Author: 22388o

README.md

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 # Javascript-DLC
 
+[![Node.js Package](https://github.com/AreaLayer/javascript-dlc/actions/workflows/npm-publish.yml/badge.svg?branch=main&event=public)](https://github.com/AreaLayer/javascript-dlc/actions/workflows/npm-publish.yml)
+
 A Javascript library for working with [Discreet Log Contracts](https://adiabat.github.io/dlc.pdf).
 
 Contributions are welcome