Invocation instructions should specify expected result

[hmeine]

Hi, I am trying to get BANG to work, believing that it's a tool that could be very useful, but I have not had a lot of success with it yet.

1. The first invocation on a large (saved) docker image led to a lot of output, but then BANG would apparently hang. (I may open a separate issue about this.)
2. I then tried with a much smaller, simpler docker image, and got no errors and no hang. Yet… I wonder what I output I should expect, and where? (There are only lines that look like filenames / image contents.) I could not find any created log file or report, for instance.

Since I used the command listed in the README, I would suggest to put a sentence below that (in the "Invocation" section) what kind of output one should expect.

[armijnhemel]

Thanks, I will look into this ASAP. Documentation is something that needs to be improved.