Add an empty test class for ViewController

Author: tomaszpieczykolan

Tests/UICoreTests/ViewControllerTests.swift

@@ -0,0 +1,8 @@
+// Copyright © 2021 Saleem Abdulrasool <compnerd@compnerd.org>
+// SPDX-License-Identifier: BSD-3-Clause
+
+import XCTest
+@testable import SwiftWin32
+
+final class ViewControllerTests: XCTestCase {
+}