Updated Readme file

Author: aishwary-vansh

Digital_Clock/README.MD

@@ -33,3 +33,9 @@ A simple Python-based digital clock application with a graphical user interface
 
 3. **Execution:**  
    The application runs continuously, keeping the time accurate until the user closes the window.
+
+## Features Added 
+- Alarm functionality 
+- 12/24 hour toggle 
+- Theme switch 
+- Improved input validation