Add benchmarks project

src/Flecs.NET.Benchmarks/Core/AddRemoveTag.cs

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+using BenchmarkDotNet.Attributes;
+using Flecs.NET.Core;
+
+namespace Flecs.NET.Benchmarks.Core
+{
+    public class AddRemoveTag
+    {
+        [Params(100000)]
+        public int EntityCount;
+
+        [Params(1, 2, 16, 32)]
+        public int TagCount;
+
+        public World World;
+        public Entity[] Entities;
+        public Entity[] Tags;
+
+        [GlobalSetup]
+        public void Setup()
+        {
+            World = World.Create();
+            Entities = new Entity[EntityCount];
+            Tags = new Entity[TagCount];
+
+            for (int i = 0; i < EntityCount; i++)
+                Entities[i] = World.Entity();
+
+            for (int i = 0; i < TagCount; i++)
+                Tags[i] = World.Entity();
+        }
+
+        [GlobalCleanup]
+        public void Cleanup()
+        {
+            World.Dispose();
+        }
+
+        [Benchmark]
+        public void Benchmark()
+        {
+            for (int e = 0; e < EntityCount; e++)
+            {
+                for (int tag = 0; tag < TagCount; tag++)
+                    Entities[e].Add(Tags[tag]);
+
+                for (int tag = 0; tag < TagCount; tag++)
+                    Entities[e].Remove(Tags[tag]);
+            }
+        }
+    }
+}

src/Flecs.NET.Benchmarks/Flecs.NET.Benchmarks.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFrameworks>netcoreapp3.1;net6.0;net7.0</TargetFrameworks>
+        <Nullable>enable</Nullable>
+        <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+        <NoWarn>$(NoWarn);CS8618</NoWarn>
+    </PropertyGroup>
+
+    <Import Project="../Flecs.NET.Native/Flecs.NET.Native.targets"/>
+
+    <ItemGroup>
+        <PackageReference Include="BenchmarkDotNet" Version="0.13.7"/>
+        <ProjectReference Include="../Flecs.NET/Flecs.NET.csproj"/>
+    </ItemGroup>
+
+</Project>

src/Flecs.NET.Benchmarks/Program.cs

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+using BenchmarkDotNet.Attributes;
+using BenchmarkDotNet.Configs;
+using BenchmarkDotNet.Jobs;
+using BenchmarkDotNet.Running;
+
+[assembly: SimpleJob(runtimeMoniker: RuntimeMoniker.Net70, launchCount: 1, warmupCount: 5, iterationCount: 10)]
+[assembly: SimpleJob(runtimeMoniker: RuntimeMoniker.Net60, launchCount: 1, warmupCount: 5, iterationCount: 10)]
+[assembly: SimpleJob(runtimeMoniker: RuntimeMoniker.NetCoreApp31, launchCount: 1, warmupCount: 5, iterationCount: 10)]
+
+namespace Flecs.NET.Benchmarks
+{
+    public static class Program
+    {
+        public static void Main(string[] args)
+        {
+            BenchmarkSwitcher benchmark = BenchmarkSwitcher.FromAssembly(typeof(Program).Assembly);
+            IConfig config = DefaultConfig.Instance.WithOptions(ConfigOptions.DisableOptimizationsValidator);
+
+            if (args.Length == 0)
+                benchmark.RunAll(config);
+            else
+                benchmark.Run(args, config);
+        }
+    }
+}