It is based on part of Physics2D.Net library, which deals with 2D geometry for games like rectangle intersections and such.
I made it for myself, so if you want to use it, chances are you will need to adapt the source code for your needs.
Lots of changes were made in process, but most of the time things should behave the same. There are few exceptions, like
BoundingRectangle.FromIntersection method — for disjointed rectangles it returns BoundingRectangle.Empty now as opposed to negative sized rectangle. As for API itself, it is pretty self-explaining: methods do what you expect them to do based on their name (I hope).
You may notice that NuGet packages are not in the repository, so do not forget to set up package restoration in Visual Studio:
Tools menu → Options → Package Manager → General → "Allow NuGet to download missing packages during build" should be selected.
If you have a build server then it needs to be setup with an environment variable 'EnableNuGetPackageRestore' set to true.
If you do not use Visual Studio, then I guess that you already know how to restore packages from console.