Feature request: Add projects to existing solution folder

[birgersp]

First of all let me just say this extension saves me a ton of work. This is a great tool!

When I add more projects with this extension, they are either placed in the solution root or some folder name (that I'll have to rename). I would like to be able to directly add them to an existing folder by right-clicking the existing folder then run this extension.

I could fork and take a look if this is something I can implement myself.