Update README.md

Author: mdabbas-cse

README.md

@@ -2,6 +2,8 @@
 ## About Lora\Core Framework
 This is a web application framework built with PHP programming language. I believe development must be an enjoyable and creative experience to be truly fulfilling. we develop any project easily by using this framework.
 
+NOTE: This framework is still under development in dev-mode branch.
+
 ## Features and Road map
 - [x] Simple and fast routing system.
 - [x] Custom routing system.