Update README.md

Author: Rog3rSm1th

README.md

@@ -5,6 +5,9 @@
 Sierra Analyzer is a security toolkit designed for analyzing Sierra files. It includes: a decompiler, a call graph</br> generator, a control-flow graph generator, and various security detectors.
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+> [!IMPORTANT]  
+> This repository is no longer maintained. If you have any questions or need further assistance, please contact [FuzzingLabs](https://fuzzinglabs.com/).
+
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 - [Project structure](#project-structure)