Update README.md

Author: konfig-publisher

README.md

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 **⚠️ All SDKs in this repository are fully deprecated as of December 2024.**
 
 - These SDKs are no longer maintained or supported.
+- While they may still function, they will become increasingly out-of-date as Splitit continues to make API updates.
+- We strongly recommend migrating to newer solutions to ensure compatibility with the latest API features.
 
 For more information, please contact [[email protected]](mailto:[email protected]).