Added macOS example project

Examples/ImagesExample-macOS/.gitignore

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+.DS_Store
+/.build
+/Packages
+/*.xcodeproj

Examples/ImagesExample-macOS/Package.swift

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+// swift-tools-version:4.2
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "ImagesExample-macOS",
+    products: [
+        // Products define the executables and libraries produced by a package, and make them visible to other packages.
+        .library(
+            name: "ImagesExample-macOS",
+            targets: ["ImagesExample-macOS"]),
+    ],
+    dependencies: [
+        .package(url: "../../PlaceholderKit", from: "0.0.3")
+    ],
+    targets: [
+        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
+        // Targets can depend on other targets in this package, and on products in packages which this package depends on.
+        .target(
+            name: "ImagesExample-macOS",
+            dependencies: ["PlaceholderKit"]),
+        .testTarget(
+            name: "ImagesExample-macOSTests",
+            dependencies: ["ImagesExample-macOS", "PlaceholderKit"]),
+    ]
+)

Examples/ImagesExample-macOS/README.md

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+# ImagesExample-macOS
+
+A description of this package.

Examples/ImagesExample-macOS/Sources/ImagesExample-macOS/ImagesExample_macOS.swift

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+struct ImagesExample_macOS {
+    var text = "Hello, World!"
+}

Examples/ImagesExample-macOS/Tests/ImagesExample-macOSTests/ImagesExample_macOSTests.swift

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+import XCTest
+@testable import ImagesExample_macOS
+
+final class ImagesExample_macOSTests: XCTestCase {
+    func testExample() {
+        // This is an example of a functional test case.
+        // Use XCTAssert and related functions to verify your tests produce the correct
+        // results.
+        XCTAssertEqual(ImagesExample_macOS().text, "Hello, World!")
+    }
+
+    static var allTests = [
+        ("testExample", testExample),
+    ]
+}

Examples/ImagesExample-macOS/Tests/ImagesExample-macOSTests/XCTestManifests.swift

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+import XCTest
+
+#if !os(macOS)
+public func allTests() -> [XCTestCaseEntry] {
+    return [
+        testCase(ImagesExample_macOSTests.allTests),
+    ]
+}
+#endif

Examples/ImagesExample-macOS/Tests/LinuxMain.swift

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+import XCTest
+
+import ImagesExample_macOSTests
+
+var tests = [XCTestCaseEntry]()
+tests += ImagesExample_macOSTests.allTests()
+XCTMain(tests)