It doesn't appear that anything at all is happening, as you describe.
Start a new VS solution using an addin wizard (http://thebuildingcoder.typepad.com/blog/2017/04/revit-2018-visual-studio-c-and-vb-net-add-in-wizards.html), and copy-paste your code over. See if that sorts you out. (The post-build event copies the files into the correct place, so you don't need to worry about that - just build it, then start Revit.)