docs: update "who use it" part of readme

README.md

@@ -74,6 +74,8 @@ To contribute to diagram, check out [contribution guidelines](CONTRIBUTING.md).
 
 [Cloudiscovery](https://github.com/Cloud-Architects/cloudiscovery) helps you to analyze resources in your cloud (AWS/GCP/Azure/Alibaba/IBM) account. It allows you to create a diagram of analyzed cloud resource map based on this Diagrams library, so you can draw the your existing cloud infratructure with Cloudicovery.
 
+[Airflow Diagrams](https://github.com/feluelle/airflow-diagrams) provides a Airflow plugin that aims to easily visualise your Airflow DAGs on service level from providers like AWS, GCP, Azure, etc. via diagrams.
+
 ## License
 
 [MIT](LICENSE)