Update README for Angular users

The introduction of standalone components in Angular v14 has changed how dependencies are added. Providing an updated example would be helpful for users. Here's a sample of how this can be done:

In the main.js file:

```
import { IonicStorageModule } from '@ionic/storage-angular';
import { Drivers } from '@ionic/storage';

//...

bootstrapApplication(AppComponent, {
providers: [
//...
importProvidersFrom(IonicStorageModule.forRoot({
name: "exampledb",
driverOrder: [Drivers.IndexedDB]
}))
],
});
```