chore: scaffold Avalonia MVVM application and test project

SongTidy.Tests/MSTestSettings.cs

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+[assembly: Parallelize(Scope = ExecutionScope.MethodLevel)]

SongTidy.Tests/ProjectSmokeTests.cs

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+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);
+    }
+}

SongTidy.Tests/SongTidy.Tests.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <LangVersion>latest</LangVersion>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="MSTest" Version="4.0.2" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Using Include="Microsoft.VisualStudio.TestTools.UnitTesting" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\SongTidy\SongTidy.csproj" />
+  </ItemGroup>
+
+</Project>