[ForEach] Add benchmark result in cs files.

Author: reegeek

src/StructLinq.Benchmark/ForEach.cs

@@ -4,6 +4,24 @@
 
 namespace StructLinq.Benchmark
 {
+
+    //BenchmarkDotNet=v0.12.0, OS=Windows 10.0.18363
+    //Intel Core i7-8750H CPU 2.20GHz(Coffee Lake), 1 CPU, 12 logical and 6 physical cores
+    //.NET Core SDK = 3.1.101
+
+    //[Host]     : .NET Core 3.1.1 (CoreCLR 4.700.19.60701, CoreFX 4.700.19.60801), X64 RyuJIT
+    //DefaultJob : .NET Core 3.1.1 (CoreCLR 4.700.19.60701, CoreFX 4.700.19.60801), X64 RyuJIT
+
+
+    //```
+    //|                      Method |     Mean |   Error |  StdDev | Ratio | Gen 0 | Gen 1 | Gen 2 | Allocated |
+    //|---------------------------- |---------:|--------:|--------:|------:|------:|------:|------:|----------:|
+    //|                  ClrForEach | 385.1 us | 1.23 us | 1.15 us |  1.00 |     - |     - |     - |      41 B |
+    //|                  WithAction | 237.9 us | 0.85 us | 0.79 us |  0.62 |     - |     - |     - |      25 B |
+    //|                  WithStruct | 142.2 us | 0.29 us | 0.27 us |  0.37 |     - |     - |     - |      24 B |
+    //|         ZeroAllocWithStruct | 139.9 us | 0.41 us | 0.38 us |  0.36 |     - |     - |     - |         - |
+    //| ToTypedEnumerableWithStruct | 384.6 us | 0.93 us | 0.82 us |  1.00 |     - |     - |     - |      66 B |
+
     [MemoryDiagnoser]
     public class ForEach
     {