Add notice to README.md

Author: shrir

README.md

@@ -22,7 +22,7 @@
 </p>
 
 > [!IMPORTANT]
-> Chapter is under active development, and is currently in public beta. This repository is updated regularly with new features and overall improvements.
+> Development on this project is paused indefinitely until further notice.
 
 <br />
 Chapter finds highly relevant leads based on your exact "niche" search criteria (e.g. OpenAPI, REST API, SDKs, release frequency, engineering team size, public facing developer docs, etc), and delivers contacts and evidence on why they are relevant.