Add initial benchmark setup

This adds all the bootstrapping to quickly add benchmarks for pieces afterwards. Instructions for running added to the README.

test/Ben.Demystifier.Benchmarks/Ben.Demystifier.Benchmarks.csproj

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+<Project Sdk="Microsoft.NET.Sdk" ToolsVersion="15.0">
+  <PropertyGroup>
+    <TargetFrameworks>netcoreapp2.0;net462</TargetFrameworks>
+    <Configuration>Release</Configuration>
+    <OutputType>Exe</OutputType>
+  </PropertyGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\..\src\Ben.Demystifier\Ben.Demystifier.csproj" />
+    <PackageReference Include="BenchmarkDotNet" Version="0.10.12" />
+  </ItemGroup>
+</Project>

test/Ben.Demystifier.Benchmarks/Exceptions.cs

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+using System;
+using System.Diagnostics;
+using BenchmarkDotNet.Attributes;
+using BenchmarkDotNet.Attributes.Jobs;
+
+namespace Ben.Demystifier.Benchmarks
+{
+    [ClrJob, CoreJob]
+    [Config(typeof(Config))]
+    public class ExceptionTests
+    {
+        [Benchmark(Baseline = true, Description = ".ToString()")]
+        public string Baseline() => new Exception().ToString();
+
+        [Benchmark(Description = "Demystify().ToString()")]
+        public string Demystify() => new Exception().Demystify().ToString();
+    }
+}

test/Ben.Demystifier.Benchmarks/Program.cs

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+using BenchmarkDotNet.Configs;
+using BenchmarkDotNet.Diagnosers;
+using BenchmarkDotNet.Running;
+using System;
+using System.Linq;
+using System.Reflection;
+
+namespace Ben.Demystifier.Benchmarks
+{
+    public static class Program
+    {
+        private const string BenchmarkSuffix = "Tests";
+
+        public static void Main(string[] args)
+        {
+            var benchmarks = Assembly.GetEntryAssembly()
+                .DefinedTypes.Where(t => t.Name.EndsWith(BenchmarkSuffix))
+                .ToDictionary(t => t.Name.Substring(0, t.Name.Length - BenchmarkSuffix.Length), t => t, StringComparer.OrdinalIgnoreCase);
+
+            if (args.Length > 0 && args[0].Equals("all", StringComparison.OrdinalIgnoreCase))
+            {
+                Console.WriteLine("Running full benchmarks suite");
+                benchmarks.Select(pair => pair.Value).ToList().ForEach(action => BenchmarkRunner.Run(action));
+                return;
+            }
+
+            if (args.Length == 0 || !benchmarks.ContainsKey(args[0]))
+            {
+                Console.WriteLine("Please, select benchmark, list of available:");
+                benchmarks
+                    .Select(pair => pair.Key)
+                    .ToList()
+                    .ForEach(Console.WriteLine);
+                Console.WriteLine("All");
+                return;
+            }
+
+            BenchmarkRunner.Run(benchmarks[args[0]]);
+
+            Console.Read();
+        }
+    }
+
+    internal class Config : ManualConfig
+    {
+        public Config() => Add(new MemoryDiagnoser());
+    }
+}