repository default configuration

While the change/visist tracking should be user specific and thus outside of version control, a project default configuration should be encouraged.
Introduce support for default configurations.

Paths? maybe
- .git-notify
- .preferances/.git-notify
- .config/.git-notify

Looking ad modern repositories, there are already a lot of meta configuration files. it would be nice to encourage a common sub dir here. Maybe there is already something used by other projects?

I'd consider to use a file type & schema like .git-ignore, since the user is familiar with it. Could we also use git config for this? Should we?