Trying to give you a fairly complete answer: It's a .NET library, the prerequisites are the same as any .NET library.
If you want to write code in .NET you will need to install the .NET SDK.
If you just want to run an application written in .NET... it depends. Apps can be shipped with a built-in .NET runtime ("self-contained"), which makes them bigger on disk but they don't need any prerequisites installed. Apps can also be shipped without a .NET runtime ("framework-dependent"), in which case the user needs to have a shared runtime installed to run the app.
If you want to write code in .NET you will need to install the .NET SDK.
If you just want to run an application written in .NET... it depends. Apps can be shipped with a built-in .NET runtime ("self-contained"), which makes them bigger on disk but they don't need any prerequisites installed. Apps can also be shipped without a .NET runtime ("framework-dependent"), in which case the user needs to have a shared runtime installed to run the app.