Multithread Quicksort challenge

The goals

1. Refresh/Learn how to work with Git/GitHub
2. Refresh/Learn how to work with C# project/solutions in VS Code
3. Refresh/Learn what is QuickSort
4. Challenge yourself to implement multithreaded version of QuickSort

Where to start

1. Good start piont is a Wikipedia article: https://en.wikipedia.org/wiki/Quicksort
2. To start working with code fork this project
3. Add a project named with your name/nickname
   dotnet new classlib -o Pikachu -f net5.0
dotnet sln add "Pikachu\Pikachu.csproj"
4. Add unit tests
   dotnet new xunit -o Pikachu.Test
dotnet add "Pikachu.Test\Pikachu.Test.csproj" reference "Pikachu\Pikachu.csproj"
dotnet sln add "Pikachu.Test\Pikachu.Test.csproj"
5. Update Benchmarks project
   dotnet add "Benchmarks/Benchmarks.csproj" reference "Pikachu\Pikachu.csproj"
6. Submit pull request

Current benchmarks

Thanks to @olegku for introducing support of https://github.com/dotnet/BenchmarkDotNet

Method	N	Mean	Error	StdDev	Ratio	RatioSD
ArraySort	10000000	843.2 ms	11.56 ms	9.65 ms	1.00	0.00
Bondar_QuickSort_Sync	10000000	905.1 ms	17.44 ms	23.28 ms	1.07	0.03
Bondar_QSort_Thread	10000000	496.0 ms	9.87 ms	9.69 ms	0.59	0.01
Bondar_QSort_Task	10000000	278.5 ms	5.46 ms	6.70 ms	0.33	0.01
Kucherenko_NaiveQSort	10000000	1,057.6 ms	7.21 ms	6.39 ms	1.26	0.02