GtkRadiant/First Room

So before you get tired of all the yada-yada about what different things are and how they work, let's do some action. The best way to learn something is usually learning by doing, and that's no different when it comes to mapping, but, because we're still in the beginning of this book, we should start out simple, let's just do a simple room to start with, we will then continue on this room in the next chapters, so let's get started.