add redux and user slice

frontend/src/store.ts

@@ -0,0 +1,15 @@
+import { configureStore } from "@reduxjs/toolkit"
+import userReducer from './shared/domain-models/userSlice'
+
+const store = configureStore({
+    reducer: {
+        user: userReducer
+    },
+});
+
+// Infer the `RootState` and `AppDispatch` types from the store itself
+export type RootState = ReturnType<typeof store.getState>
+// Inferred type: {posts: PostsState, comments: CommentsState, users: UsersState}
+export type AppDispatch = typeof store.dispatch
+
+export default store