Update README.md

Author: Miro-wq

README.md

@@ -1,6 +1,7 @@
-# Contact book, part 2
+# Contact book, part 3 integrating state management with Redux Toolkit
 
-Added storing phonebook contacts in localStorage. Component life cycle methods used.
+Refactor the Contact Book Application
+This project refactors the Contact Book app by integrating state management with Redux Toolkit. It includes actions for saving, deleting contacts, and updating the filter. The app uses redux-persist to store the contacts in localStorage and connects React components with Redux using react-redux. The initial Redux state consists of an empty contacts array and a filter string.
 
 ## 🛠 Tools used