examples/simple-chatbot: move clients to client directory

examples/simple-chatbot/client/ios/SimpleChatbot/views/PreJoinView.swift

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+import SwiftUI
+
+struct PreJoinView: View {
+    
+    @State var backendURL: String
+
+    @EnvironmentObject private var model: CallContainerModel
+    
+    init() {
+        let currentSettings = SettingsManager.getSettings()
+        self.backendURL = currentSettings.backendURL
+    }
+
+    var body: some View {
+        VStack(spacing: 20) {
+            Image("pipecat")
+                .resizable()
+                .frame(width: 80, height: 80)
+            Text("Pipecat Client iOS.")
+                .font(.headline)
+            TextField("Server URL", text: $backendURL)
+                .textFieldStyle(RoundedBorderTextFieldStyle())
+                .frame(maxWidth: .infinity)
+                .padding([.bottom, .horizontal])
+            Button("Connect") {
+                self.model.connect(backendURL: self.backendURL)
+            }
+            .padding()
+            .background(Color.black)
+            .foregroundColor(.white)
+            .cornerRadius(8)
+        }
+        .padding()
+        .frame(maxHeight: .infinity)
+        .background(Color.backgroundApp)
+        .toast(message: model.toastMessage, isShowing: model.showToast)
+    }
+}
+
+#Preview {
+    PreJoinView().environmentObject(MockCallContainerModel() as CallContainerModel)
+}