Prepare v0.13.6 changelog

Author: AndreyAkinshin

docs/_changelog/footer/v0.13.6.md

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+_Date: TBA_
+
+_Milestone: [v0.13.6](https://github.com/dotnet/BenchmarkDotNet/issues?q=milestone%3Av0.13.6)_
+([List of commits](https://github.com/dotnet/BenchmarkDotNet/compare/v0.13.5...v0.13.6))
+
+_NuGet Packages:_
+* https://www.nuget.org/packages/BenchmarkDotNet/0.13.6
+* https://www.nuget.org/packages/BenchmarkDotNet.Diagnostics.Windows/0.13.6
+* https://www.nuget.org/packages/BenchmarkDotNet.Diagnostics.dotTrace/0.13.6
+* https://www.nuget.org/packages/BenchmarkDotNet.Annotations/0.13.6
+* https://www.nuget.org/packages/BenchmarkDotNet.Templates/0.13.6

docs/_changelog/header/v0.13.6.md

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+## Highlights
+
+* New [BenchmarkDotNet.Diagnostics.dotTrace](https://www.nuget.org/packages/BenchmarkDotNet.Diagnostics.dotTrace) NuGet package.
+  Once this package is installed, you can annotate your benchmarks with the `[DotTraceDiagnoser]` and get a [dotTrace](https://www.jetbrains.com/profiler/) performance snapshot at the end of the benchmark run.
+  [#2328](https://github.com/dotnet/BenchmarkDotNet/pull/2328)
+* Updated documentation website.
+  We migrated to [docfx](https://dotnet.github.io/docfx/) 2.67 and got the refreshed modern template based on bootstrap 5 with dark/light theme switcher.
+* Updated [BenchmarkDotNet.Templates](https://www.nuget.org/packages/BenchmarkDotNet.Templates).
+  Multiple issues were resolved, now you can create new benchmark projects from terminal or your favorite IDE.
+  [#1658](https://github.com/dotnet/BenchmarkDotNet/issues/1658)
+  [#1881](https://github.com/dotnet/BenchmarkDotNet/issues/1881)
+  [#2149](https://github.com/dotnet/BenchmarkDotNet/issues/2149)
+  [#2338](https://github.com/dotnet/BenchmarkDotNet/pull/2338)
+* Response file support.
+  Now it's possible to pass additional arguments to BenchmarkDotNet using `@filename` syntax.
+  [#2320](https://github.com/dotnet/BenchmarkDotNet/pull/2320)
+  [#2348](https://github.com/dotnet/BenchmarkDotNet/pull/2348)
+* Custom runtime support.
+  [#2285](https://github.com/dotnet/BenchmarkDotNet/pull/2285)
+* Introduce CategoryDiscoverer, see [`IntroCategoryDiscoverer`](xref:BenchmarkDotNet.Samples.IntroCategoryDiscoverer).
+  [#2306](https://github.com/dotnet/BenchmarkDotNet/issues/2306)
+  [#2307](https://github.com/dotnet/BenchmarkDotNet/pull/2307)
+* Multiple bug fixes.