Improve ReadME

[awilliamson]

As it stands the ReadMe is somewhat long and wordy. It may aid new, and potentially inexperienced users in installing and configuring the mod if the ReadMe was more concise and user-centric for installation.

The nitty gritty of how rsync works is really of no benefit to the average user; they care about more high-level concepts such as configuration settings, and impact/behaviour to their server.
A section for the 'science' behind why it works may be good, but I recommend this to be left for the end of the ReadMe.

I can possibly PR a new suggestion for the ReadMe at some point if you would like?

[alexbobp]

Hehe you caught me, I'm no tech writer. I would be very grateful for a PR if you're interested in taking this on!

Like my other small mod, I made this to scratch an itch and how to make it mass market ready is something I'm still learning.