在SwiftUI中使用Firebase进行用户管理，从哪里开始？

dependencies: [
    .package(url: "https://github.com/firebase/firebase-ios-sdk.git", from: "8.0.0")
]

import Firebase

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    FirebaseApp.configure()
    return true
}

import FirebaseAuth

func signUp(email: String, password: String) {
    Auth.auth().createUser(withEmail: email, password: password) { (user, error) in
        if let error = error {
            print("Error signing up: \(error.localizedDescription)")
        } else {
            print("User signed up successfully")
        }
    }
}

func signIn(email: String, password: String) {
    Auth.auth().signIn(withEmail: email, password: password) { (user, error) in
        if let error = error {
            print("Error signing in: \(error.localizedDescription)")
        } else {
            print("User signed in successfully")
        }
    }
}

import SwiftUI
import Firebase

class UserViewModel: ObservableObject {
    @Published var user: User?
    
    init() {
        if let user = Auth.auth().currentUser {
            self.user = user
        }
    }
}

struct UserProfileView: View {
    @ObservedObject var viewModel = UserViewModel()
    
    var body: some View {
        VStack {
            if let user = viewModel.user {
                Text("User ID: \(user.uid)")
                Text("Email: \(user.email ?? "")")
            } else {
                Text("No user logged in")
            }
        }
    }
}