added npm badge

Author: prashantswami

README.md

@@ -1,4 +1,6 @@
 ![status](https://github.com/prashantswami/eslint-plugin-test-id/actions/workflows/pull-requests.yml/badge.svg?branch=main)
+![npm](https://badge.fury.io/js/eslint-plugin-test-id.svg)
+
 # eslint-plugin-test-id
 
 This checks is data-test-id prop is present, on some tags which are useful for e2e testing