Add benchmarks project

tests/Roslyn.Benchmarks/MSBuildWorkspaceBenchmarks.cs

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+using System.Diagnostics;
+using BenchmarkDotNet.Attributes;
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.MSBuild;
+
+namespace Roslyn.Benchmarks;
+
+public class MSBuildWorkspaceBenchmarks
+{
+	private const string _solutionFilePath = "C:/Users/Matthew/Documents/Git/StatusApp/StatusApp.sln";
+
+	[Benchmark]
+	public async Task<Solution> ParseSolutionFileFromPath()
+	{
+		var workspace = MSBuildWorkspace.Create();
+		var solution = await workspace.OpenSolutionAsync(_solutionFilePath);
+		return solution;
+	}
+}

tests/Roslyn.Benchmarks/Program.cs

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+using BenchmarkDotNet.Running;
+using Roslyn.Benchmarks;
+
+BenchmarkRunner.Run<MSBuildWorkspaceBenchmarks>();

tests/Roslyn.Benchmarks/Roslyn.Benchmarks.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="BenchmarkDotNet" Version="0.14.0" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="4.12.0" />
+    <PackageReference Include="Microsoft.CodeAnalysis.Workspaces.MSBuild" Version="4.12.0" />
+  </ItemGroup>
+
+</Project>