Add a way to get a short help showing actual use

[tbrowder]

Suggestion:

$ rak
# OUTPUT
...example use from README

[lizmat]

Next version of App::Rak will have:

$ rak       
Should at least specify a pattern.  For instance:

  rak foo

will look for "foo" in all text files in the current directory
and any sub-directories. See:

  rak --help

for (much) more information.

[tbrowder]

Sounds great, thanks!

[lizmat]

Now in the ecosystem, so closing.