Add localStorage load+save feature

src/app/store.js

@@ -1,8 +1,17 @@
 import { configureStore } from "@reduxjs/toolkit";
 import boardReducer from "../storeSlices/boardSlice";
+import { saveState } from "../utils/persistStateUtils";
 
-export default configureStore({
+const store = configureStore({
   reducer: {
     board: boardReducer
   }
 });
+
+// Save state in localStorage, on save
+// Loading code in reducers
+store.subscribe(() => {
+  saveState(store.getState());
+});
+
+export default store;