Entrypoint script modified to accept command-line arguments

[Lewiscowles1986]

If you look at this gist you'll see you can use the entrypoint as a script so that the docker image can accept cli commands.

https://gist.github.com/Lewiscowles1986/d4ef75a2d9c3e7d6e1794c3e90246c9a

This could be useful as part of #1

If you were open to receiving a PR, I think I can modify the entrypoint and dockerfile so that a folder exists in the image (but can be mounted with -v) to allow the output file to be saved. You can then bake-in commands that enable users to type less, and establish conventions (such as where to mount)

Just some ideas