You can use Visual studio latest IDE to open this solution file https://github.intuit.com/PTG/TreeifyTask/blob/master/Source/TreeifyTask.sln. This solution file contains the actual source, tests and sample projects to visualize the TreeifyTask project. You can refer the sample projects available in Blazor and WPF to play around.
This is a Nuget component developed in .NET that can be referred by .NET project.