Add Authsignal to the adopters list (#729)

Author: benjagm

ADOPTERS.md

@@ -40,6 +40,7 @@ By supporting JSON Schema with a case study, you are documenting its success and
 
 | Organization | Contact | Description of Use / Reference |
 | --- | --- | --- |
+| [Authsignal](https://www.authsignal.com/) | Infer typescript types for HTTP request/response models (using the json-schema-to-ts library). |
 | [Automatic Data Processing (ADP)](https://www.adp.com/) | [Jeremy Fiel](mailto:jeremy.fiel@adp.com?subject=I%20love%20JSON%20Schema%20too!) | [ADP Developer Resources](https://developers.adp.com/welcome) |
 | [Cookpad](https://cookpad.com/) | [Kenshi Shiode](https://www.linkedin.com/in/kenshi-shiode-b65922212/) | [Cookpad JSON Schema case study](https://json-schema.org/blog/posts/cookpad-case-study-en) |
 | [Cyclops](https://cyclops-ui.com/) | [Petar Cvitanović](https://www.linkedin.com/in/petar-cvit/) | [Cyclops is a powerful user interface for managing and interacting with Kubernetes clusters](https://cyclops-ui.com/blog/2023/11/13/JSON-schemas) |