macos: starting boilerplate

macos/.gitignore

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+.DS_Store
+/.build
+/Packages
+/*.xcodeproj
+xcuserdata/
+DerivedData/
+.swiftpm/config/registries.json
+.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
+.netrc

macos/Package.swift

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+// swift-tools-version: 5.7
+// The swift-tools-version declares the minimum version of Swift required to
+// build this package.
+
+import PackageDescription
+
+let package = Package(
+  name: "Ghostty",
+  platforms: [
+    // SwiftUI
+    .macOS(.v11),
+  ],
+  dependencies: [],
+  targets: [
+    .executableTarget(
+      name: "Ghostty",
+      dependencies: []),
+  ]
+)

macos/Sources/Ghostty/main.swift

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+import SwiftUI
+
+@main
+struct Ghostty: App {
+  var body: some Scene {
+    WindowGroup {
+      ContentView()
+    }
+  }
+}
+
+struct ContentView: View {
+  @StateObject var viewModel: ViewModel  = ViewModel()
+
+  var body: some View {
+    TextField("", text: $viewModel.inputText)
+      .padding()
+  }
+}
+
+public class ViewModel: ObservableObject {
+  @Published var inputText: String = ""
+}