How do you add all source files that haven't already been added?

My team is using netbeans with a git repository.  When I work with git on
the commandline, new files appear that netbeans doesn't know about.  How can
I get netbeans to automatically add all source files in the current
directory that it doesn't already know about?

Are there any files under nbproject that you would recommend putting under
revision control alongside the code?  Putting the whole directory under
revision control seems problematic as different people might have some
different settings, but the majority of the settings should be the same for
everyone.