main readme refer cli npm package

README.md

@@ -107,6 +107,9 @@ Options:
   -h, --help                       display help for command
 ```
 
+### Command line npm package (CLI)
+The gbfs-validator CLI Node.js npm package is now accessible for integration into your projects. To learn how to install and utilize it effectively, please refer to the [README](./gbfs-validator/README.md) for comprehensive guidance.
+
 ## Projects based on this validator
 
 [transport.data.gouv.fr GBFS validator tool](https://transport.data.gouv.fr/validation?type=gbfs) - Tool displaying interactive geofencing, station, and vehicle maps, the validation results, and metadata of GBFS feeds.