Please add more details to the README

[perionjames]

It would be helpful to the outside observer, things like:

1. Getting started
2. Examples of things you can do with the repo, such as test trades etc.
3. Running and using the software
4. Explanation of how trades work in a nutshell

It would be very helpful if these could be added to the README, thank you.

[stoobie]

Also it would be helpful to add minimum requirements, especially minimum disk space on the partition where the docker image(s) are built.