Add SharpIDE.Application unit test project

tests/SharpIDE.Application.UnitTests/GlobalUsings.cs

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+global using Xunit;
+global using AwesomeAssertions;

tests/SharpIDE.Application.UnitTests/SharpIDE.Application.UnitTests.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <OutputType>Exe</OutputType>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <UseMicrosoftTestingPlatformRunner>true</UseMicrosoftTestingPlatformRunner>
+    <!--
+      Microsoft Testing Platform docs
+      https://xunit.net/docs/getting-started/v3/microsoft-testing-platform
+    -->
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Content Include="xunit.runner.json" CopyToOutputDirectory="PreserveNewest" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="AwesomeAssertions" />
+    <PackageReference Include="xunit.v3.mtp-v2" />
+  </ItemGroup>
+
+</Project>

tests/SharpIDE.Application.UnitTests/UnitTest1.cs

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+namespace SharpIDE.Application.UnitTests;
+
+public class UnitTest1
+{
+    [Fact]
+    public void Test1()
+    {
+	    true.Should().BeTrue();
+    }
+}

tests/SharpIDE.Application.UnitTests/xunit.runner.json

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+{
+    "$schema": "https://xunit.net/schema/current/xunit.runner.schema.json"
+}