Merge pull request #199 from supertone-inc/agent/add-development-discontinuation-notice

add development discontinuation notice

Author: juheo

README.md

@@ -1,5 +1,16 @@
 # Supertonic — Lightning Fast, On-Device, Accurate TTS
 
+> [!CAUTION]
+> ## ⚠️ Service and Repository Notice (July 23, 2026)
+>
+> **This repository will be archived, and there will be no further development or official support for the open-source Supertonic models.**
+>
+> **Voice Builder will no longer be accessible after August 31, 2026.**
+>
+> For details about the service changes, timeline, and information for existing Voice Builder users, please see the [official announcement](https://supertone.ai).
+>
+> Thank you to everyone who has used, contributed to, and supported Supertonic.
+
 <p align="center">
   <img src="img/Supertonic3_HeroImage.png" alt="Supertonic 3 Banner">
 </p>