Initial Shaft render backend impl

.vscode/settings.json

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+{
+    "swift.path": "/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin",
+    "swift.swiftEnvironmentVariables": {
+        "DEVELOPER_DIR": "/Applications/Xcode.app/Contents/Developer"
+    }
+}

Example/ShaftExample/.gitignore

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+.build

Example/ShaftExample/Package.swift

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+// swift-tools-version: 6.1
+
+import PackageDescription
+
+let package = Package(
+    name: "ShaftExample",
+    platforms: [
+        .macOS(.v15),
+        .iOS(.v18),
+    ],
+    products: [
+        .executable(name: "ShaftExample", targets: ["ShaftExample"]),
+    ],
+    dependencies: [
+        .package(path: "../../"),  // OpenSwiftUI
+    ],
+    targets: [
+        .executableTarget(
+            name: "ShaftExample",
+            dependencies: [
+                .product(name: "OpenSwiftUI", package: "OpenSwiftUI"),
+                .product(name: "OpenSwiftUIShaftBackend", package: "OpenSwiftUI"),
+            ],
+            swiftSettings: [
+                .interoperabilityMode(.Cxx),
+            ]
+        ),
+    ],
+    cxxLanguageStandard: .cxx17,
+)
+

Example/ShaftExample/Sources/ShaftExample/main.swift

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+//
+//  main.swift
+//  ShaftExample
+//
+//  Example application demonstrating OpenSwiftUI rendering via Shaft
+//
+
+import Foundation
+import OpenSwiftUI
+import OpenSwiftUIShaftBackend
+
+// Define a simple OpenSwiftUI view
+struct ContentView: View {
+    var body: some View {
+        VStack {
+            Color.red
+                .frame(width: 100, height: 60)
+            Spacer()
+            Color.blue
+                .frame(width: 100, height: 60)
+                .rotationEffect(.degrees(45))
+            Spacer()
+            Color.green
+                .frame(width: 100, height: 60)
+        }
+    }
+}
+
+// Run the application
+ShaftHostingView.run(rootView: ContentView())