Skeleton VisionOS app

## Context
We are building a sample app for VisionOS to demonstrate the usage of CustomerIO SwiftSDK in VisionOS.

## In this PR
In this PR we are introducing a new empty VisionOS app, with a single `Hello World` screen and the Swift Package Manger dependencies that will be used. Namely:
- `swift-markdown-ui`: which will be used for imarkdown rendering.
- `'splash`: dependency to create custom code syntax highlighting themes.
- `customerio-swift`: local dependency on the CIO Swift SDK

## Test Plan:
- Open visionos.xcproject in Xcode
- Make sure you have VisionOS simulator installed and selected
- CMD+R to run the app and see the `Hello World` screen

Apps/visionos/visionos.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

@@ -0,0 +1,8 @@
+<?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>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

Apps/visionos/visionos/Assets.xcassets/AppIcon.solidimagestack/Back.solidimagestacklayer/Content.imageset/Contents.json

@@ -0,0 +1,12 @@
+{
+  "images" : [
+    {
+      "idiom" : "vision",
+      "scale" : "2x"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Apps/visionos/visionos/Assets.xcassets/AppIcon.solidimagestack/Back.solidimagestacklayer/Contents.json

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

Apps/visionos/visionos/Assets.xcassets/AppIcon.solidimagestack/Contents.json

@@ -0,0 +1,17 @@
+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  },
+  "layers" : [
+    {
+      "filename" : "Front.solidimagestacklayer"
+    },
+    {
+      "filename" : "Middle.solidimagestacklayer"
+    },
+    {
+      "filename" : "Back.solidimagestacklayer"
+    }
+  ]
+}

Apps/visionos/visionos/Assets.xcassets/AppIcon.solidimagestack/Front.solidimagestacklayer/Content.imageset/Contents.json

@@ -0,0 +1,12 @@
+{
+  "images" : [
+    {
+      "idiom" : "vision",
+      "scale" : "2x"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Apps/visionos/visionos/Assets.xcassets/AppIcon.solidimagestack/Front.solidimagestacklayer/Contents.json

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

Apps/visionos/visionos/Assets.xcassets/AppIcon.solidimagestack/Middle.solidimagestacklayer/Content.imageset/Contents.json

@@ -0,0 +1,12 @@
+{
+  "images" : [
+    {
+      "idiom" : "vision",
+      "scale" : "2x"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Apps/visionos/visionos/Assets.xcassets/AppIcon.solidimagestack/Middle.solidimagestacklayer/Contents.json

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

Apps/visionos/visionos/Assets.xcassets/Contents.json

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

Apps/visionos/visionos/ContentView.swift

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+import SwiftUI
+
+struct ContentView: View {
+    var body: some View {
+        VStack {
+
+            Text("Hello, world!")
+        }
+        .padding()
+    }
+}
+
+#Preview(windowStyle: .automatic) {
+    ContentView()
+}

Apps/visionos/visionos/Info.plist

@@ -0,0 +1,15 @@
+<?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>UIApplicationSceneManifest</key>
+	<dict>
+		<key>UIApplicationPreferredDefaultSceneSessionRole</key>
+		<string>UIWindowSceneSessionRoleApplication</string>
+		<key>UIApplicationSupportsMultipleScenes</key>
+		<true/>
+		<key>UISceneConfigurations</key>
+		<dict/>
+	</dict>
+</dict>
+</plist>

Apps/visionos/visionos/Preview Content/Preview Assets.xcassets/Contents.json

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

Apps/visionos/visionos/visionosApp.swift

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+//
+//  visionosApp.swift
+//  visionos
+//
+//  Created by Ahmed Ali on 29/02/2024.
+//
+
+import SwiftUI
+
+@main
+struct visionosApp: App {
+    var body: some Scene {
+        WindowGroup {
+            ContentView()
+        }
+    }
+}