Add initial benchmarking project

DotTiled.Benchmark/DotTiled.Benchmark.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="BenchmarkDotNet" Version="0.13.12" />
+    <PackageReference Include="TiledLib" Version="4.0.3" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\DotTiled\DotTiled.csproj" />
+  </ItemGroup>
+
+</Project>

DotTiled.Benchmark/Program.cs

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+using System;
+using System.Security.Cryptography;
+using BenchmarkDotNet.Attributes;
+using BenchmarkDotNet.Running;
+
+namespace MyBenchmarks
+{
+  public class MapLoader
+  {
+    public MapLoader()
+    {
+    }
+
+    [Benchmark]
+    public DotTiled.Map LoadWithDotTiled()
+    {
+      throw new NotImplementedException();
+    }
+
+    [Benchmark]
+    public TiledLib.Map LoadWithTiledLib()
+    {
+      throw new NotImplementedException();
+    }
+  }
+
+  public class Program
+  {
+    public static void Main(string[] args)
+    {
+      //var summary = BenchmarkRunner.Run<Md5VsSha256>();
+    }
+  }
+}