Initial package structure

.github/FUNDING.yml

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+github: [mattmassicotte]

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches:
+      - main
+    paths-ignore:
+      - 'README.md'
+      - 'CODE_OF_CONDUCT.md'
+      - '.editorconfig'
+      - '.spi.yml'
+  pull_request:
+    branches:
+      - main
+
+env:
+  DEVELOPER_DIR: /Applications/Xcode_15.2.app/Contents/Developer
+
+jobs:
+  test:
+    name: Test
+    runs-on: macOS-13
+    strategy:
+      matrix:
+        destination:
+          - "platform=macOS"
+          - "platform=macOS,variant=Mac Catalyst"
+          - "platform=iOS Simulator,name=iPhone 11"
+          - "platform=tvOS Simulator,name=Apple TV"
+          - "platform=visionOS Simulator,name=Apple Vision Pro"
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Test platform ${{ matrix.destination }}
+        run: set -o pipefail && xcodebuild -scheme Textbook -destination "${{ matrix.destination }}" test | xcbeautify

Package.swift

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+// swift-tools-version: 5.8
+
+import PackageDescription
+
+let package = Package(
+	name: "Textbook",
+	platforms: [
+		.macOS(.v10_15),
+		.macCatalyst(.v13),
+		.iOS(.v13),
+		.tvOS(.v13),
+	],
+	products: [
+		.library(name: "Textbook", targets: ["Textbook"]),
+	],
+	targets: [
+		.target(name: "Textbook"),
+		.testTarget(name: "TextbookTests", dependencies: ["Textbook"]),
+	]
+)
+
+let swiftSettings: [SwiftSetting] = [
+	.enableExperimentalFeature("StrictConcurrency"),
+]
+
+for target in package.targets {
+	var settings = target.swiftSettings ?? []
+	settings.append(contentsOf: swiftSettings)
+	target.swiftSettings = settings
+}

Sources/Textbook/Platform.swift

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+import SwiftUI
+
+#if os(macOS) && !targetEnvironment(macCatalyst)
+import AppKit
+
+typealias NSUITextView = NSTextView
+
+#elseif os(iOS) || os(tvOS) || os(visionOS)
+import UIKit
+
+typealias NSUITextView = UITextView
+#endif

Sources/Textbook/Textbook.swift

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+// The Swift Programming Language
+// https://docs.swift.org/swift-book

Tests/TextbookTests/TextbookTests.swift

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+import XCTest
+@testable import Textbook
+
+final class TextbookTests: XCTestCase {
+    func testExample() throws {
+        // XCTest Documentation
+        // https://developer.apple.com/documentation/xctest
+
+        // Defining Test Cases and Test Methods
+        // https://developer.apple.com/documentation/xctest/defining_test_cases_and_test_methods
+    }
+}