Create a SwiftUI demo app, and consume Fluent via Swift Package (#2075)

Demo/FluentUIDemo/Assets.xcassets/AccentColor.colorset/Contents.json

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+{
+  "colors" : [
+    {
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Demo/FluentUIDemo/Assets.xcassets/AppIcon.appiconset/Contents.json

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+{
+  "images" : [
+    {
+      "filename" : "FluentUIDemo_iOS.png",
+      "idiom" : "universal",
+      "platform" : "ios",
+      "size" : "1024x1024"
+    },
+    {
+      "filename" : " Icon-16.png",
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "16x16"
+    },
+    {
+      "filename" : " Icon-16_2x.png",
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "16x16"
+    },
+    {
+      "filename" : " Icon-32.png",
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "32x32"
+    },
+    {
+      "filename" : " Icon-32_2x.png",
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "32x32"
+    },
+    {
+      "filename" : " Icon-128.png",
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "128x128"
+    },
+    {
+      "filename" : " Icon-128_2x-1.png",
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "128x128"
+    },
+    {
+      "filename" : " Icon-128_2x.png",
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "256x256"
+    },
+    {
+      "filename" : " Icon-256_2x.png",
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "256x256"
+    },
+    {
+      "filename" : " Icon-512.png",
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "512x512"
+    },
+    {
+      "filename" : " Icon-512_2x.png",
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "512x512"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Demo/FluentUIDemo/Assets.xcassets/Contents.json

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+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Demo/FluentUIDemo/ContentView.swift

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+//
+//  Copyright (c) Microsoft Corporation. All rights reserved.
+//  Licensed under the MIT License.
+//
+
+import SwiftUI
+import FluentUI
+
+struct ContentView: View {
+#if os(macOS)
+    // Until we have a SwiftUI button on macOS, this will have to do.
+    private struct ButtonRepresentable: NSViewRepresentable {
+        func makeNSView(context: Context) -> some NSView {
+            return FluentUI.Button(title: "Hello, world!",
+                                   image: .init(systemSymbolName: "globe", accessibilityDescription: nil))
+        }
+
+        func updateNSView(_ nsView: NSViewType, context: Context) {
+        }
+    }
+#endif
+
+    var body: some View {
+        VStack {
+#if os(macOS)
+            ButtonRepresentable()
+                .fixedSize()
+#else
+            Button(action: {}, label: {
+                HStack {
+                    Image(systemName: "globe")
+                        .imageScale(.large)
+                    Text("Hello, world!")
+                }
+            })
+            .buttonStyle(FluentButtonStyle(style: .accent))
+            .controlSize(.extraLarge)
+#endif
+        }
+        .padding()
+    }
+}

Demo/FluentUIDemo/FluentUIDemo.entitlements

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <key>com.apple.security.app-sandbox</key>
+    <true/>
+    <key>com.apple.security.files.user-selected.read-only</key>
+    <true/>
+</dict>
+</plist>

Demo/FluentUIDemo/FluentUIDemoApp.swift

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+//
+//  Copyright (c) Microsoft Corporation. All rights reserved.
+//  Licensed under the MIT License.
+//
+
+import SwiftUI
+
+@main
+struct FluentUIDemoApp: App {
+    var body: some Scene {
+        WindowGroup {
+            ContentView()
+        }
+    }
+}

Demo/FluentUIDemo/Preview Content/Preview Assets.xcassets/Contents.json

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+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}