chore: scaffold Avalonia MVVM application and test project

SongTidy.Tests/ProjectSmokeTests.cs

@@ -0,0 +1,17 @@
+namespace SongTidy.Tests;
+
+/// <summary>
+/// Contains baseline tests that verify the test project is wired to the application assembly.
+/// </summary>
+[TestClass]
+public sealed class ProjectSmokeTests {
+    /// <summary>
+    /// Verifies that the main application assembly can be loaded from the test project.
+    /// </summary>
+    [TestMethod]
+    public void MainAssemblyIsReferenced() {
+        var assemblyName = typeof(global::SongTidy.ViewModels.MainWindowViewModel).Assembly.GetName().Name;
+
+        Assert.AreEqual("SongTidy", assemblyName);
+    }
+}