Documentation about toolbox HOT 1 CLOSED

@cgwalters reworked the README.md in #43 It would be good to have some manual pages too.

• what this project really wants to solve (I mean, the ostree image is fixed,
  okay, but what can I do now what I could not do before?)

...

• what I can actually do inside of it?

The earlier version of the README.md still had this text:

... use DNF to install your favorite packages, all without worrying about breaking
your operating system.

Ultimately, once you actually start using Silverblue, it becomes obvious what Fedora Toolbox aims to solve or why you would want to use it. :)

If you want an example use case take full system backups, e.g. with borgbackup
and possibly some wrapper scripts and where
you need to setup a cron
job or systemd timer, and special stuff like that.

Umm... I don't think we can describe all the different things that one could possibly do inside the toolbox environment. After all, it's a full-fledged RPM based userspace environment.

Or even advanced stuff like notifications
(i.e. zenity), which I guess is a little hard to make work manually.

What do you mean by "manually"? Notifications should just work the same way they always did and do on the host. For example, try:

$ gdbus call --session --dest org.gtk.Notifications --object-path /org/gtk/Notifications --method org.gtk.Notifications.AddNotification "org.gnome.Terminal" "fedora-toolbox: hello world" "@a{sv} [{'title', <'Hello World'>}, {'body', <'Say hello to Fedora Toolbox'>}]"

from toolbox.