feat(folio): add iOS app icon (black bg, white dot)

examples/folio/app/iosApp/iosApp/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -0,0 +1,14 @@
+{
+  "images" : [
+    {
+      "filename" : "icon-1024.png",
+      "idiom" : "universal",
+      "platform" : "ios",
+      "size" : "1024x1024"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

examples/folio/app/iosApp/iosApp/Assets.xcassets/Contents.json

@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

examples/folio/app/iosApp/project.yml

@@ -25,6 +25,7 @@ targets:
         PRODUCT_BUNDLE_IDENTIFIER: app.folio
         PRODUCT_NAME: iosApp
         INFOPLIST_FILE: iosApp/Info.plist
+        ASSETCATALOG_COMPILER_APPICON_NAME: AppIcon
         # The Kotlin framework slice differs by SDK: device builds link the
         # iosArm64 framework, simulator builds the iosSimulatorArm64 one. The
         # search path and the prebuild gradle task both follow this variable.