Add a Swift Playground as an example

Examples/GoogleAIPlayground.swiftpm/GenerateTextView.swift

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+import GoogleGenerativeAI
+import SwiftUI
+
+struct GenerateTextView: View {
+  let model = GenerativeModel(
+    name: "gemini-pro",
+    // Enter your API key below; do not share or commit it.
+    apiKey: "MY_API_KEY"
+  )
+
+  @State var text: String = ""
+  @State var prompt: String = ""
+
+  var body: some View {
+    VStack {
+      ScrollView {
+        Text(text)
+      }
+      Spacer()
+      HStack {
+        TextField("Enter a prompt...", text: $prompt)
+        Button("Send", systemImage: "arrow.up.circle.fill") {
+          generateText()
+        }.labelStyle(.iconOnly)
+      }
+    }.padding()
+  }
+
+  func generateText() {
+    Task {
+      do {
+        let response = try await model.generateContent(prompt)
+        guard let responseText = response.text else {
+          text = "No text in response"
+          return
+        }
+        text = responseText
+      } catch {
+        print(error)
+        text = error.localizedDescription
+      }
+    }
+  }
+}

Examples/GoogleAIPlayground.swiftpm/GoogleAIPlaygroundApp.swift

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+import GoogleGenerativeAI
+import SwiftUI
+
+@main
+struct GoogleAIPlaygroundApp: App {
+  var body: some Scene {
+    WindowGroup {
+      GenerateTextView()
+    }
+  }
+}

Examples/GoogleAIPlayground.swiftpm/Package.swift

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+// swift-tools-version: 5.9
+
+// WARNING:
+// This file is automatically generated.
+// Do not edit it by hand because the contents will be replaced.
+
+import AppleProductTypes
+import PackageDescription
+
+let package = Package(
+  name: "Google AI Playground",
+  platforms: [
+    .iOS("16.0"),
+  ],
+  products: [
+    .iOSApplication(
+      name: "Google AI Playground",
+      targets: ["AppModule"],
+      displayVersion: "1.0",
+      bundleVersion: "1",
+      appIcon: .placeholder(icon: .pencil),
+      accentColor: .presetColor(.blue),
+      supportedDeviceFamilies: [
+        .pad,
+        .phone,
+      ],
+      supportedInterfaceOrientations: [
+        .portrait,
+        .landscapeRight,
+        .landscapeLeft,
+        .portraitUpsideDown(.when(deviceFamilies: [.pad])),
+      ],
+      capabilities: [
+        .outgoingNetworkConnections(),
+      ]
+    ),
+  ],
+  dependencies: [
+    .package(url: "https://github.com/google/generative-ai-swift.git", "0.4.3" ..< "0.5.0"),
+  ],
+  targets: [
+    .executableTarget(
+      name: "AppModule",
+      dependencies: [
+        .product(name: "GoogleGenerativeAI", package: "generative-ai-swift"),
+      ],
+      path: ".",
+      swiftSettings: [
+        .enableUpcomingFeature("BareSlashRegexLiterals"),
+      ]
+    ),
+  ]
+)