How to parsing JSON in SwiftUI as beginner?

It still saying " ReadData() doesn’t find in scope " please I need help to fix this
ContentView…
import SwiftUI

struct ContentView: View {
@ObservedObject var datas = ReadData()

var body: some View {
    List(datas.users){ user in
        
        VStack(alignment: .leading) {
            
            Text(user.name)
                .font(.title)
                .fontWeight(.heavy)
                .foregroundColor(Color.gray)
                
            HStack{
                Text(user.designation)
                    .font(.title3)
                    .foregroundColor(Color.red)
                    
                Spacer()
                Text(user.email)
                    .font(.title3)
            }
        }
    }
}

}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}

New file:…
import Foundation
struct User: Codable, Identifiable {
enum CodingKeys: CodingKey {
case name
case designation
case email
}

var id = UUID()
var name: String
var designation: String
var email: String

}
class ReadData: ObservableObject {
@Published var users = User

init(){
    loadData()
}



func loadData()  {
    guard let url = Bundle.main.url(forResource: "Userdata", withExtension: "json")
        else {
            print("Json file not found")
            return
        }
    
    let data = try? Data(contentsOf: url)
    let users = try? JSONDecoder().decode([User].self, from: data!)
    self.users = users!
    
}

}