feat: add warning message in readme.md

Author: haxgun

README.md

@@ -5,6 +5,10 @@
 
 # Valory
 
+> [!WARNING]
+> ⚠ <strong>This branch is unstable!</strong>  New functions are introduced here that may not work correctly.
+
+
 [![CI/CD](https://github.com/haxgun/valory/actions/workflows/master.yml/badge.svg)](https://github.com/haxgun/valory/actions/workflows/master.yml)
 [![GitHub License](https://img.shields.io/github/license/haxgun/valory)](https://github.com/haxgun/valory/blob/main/LICENSE)
 [![Website](https://img.shields.io/website?url=https://overlay.haxgun.ru)](https://overlay.haxgun.ru/)