Documentation suggestions

Hi,

As a new user to the project who has struggled a little with building a picture of what it can and should be used for, I wanted to contribute some suggestions to the documentation to try to help people like me. This has come from my initial comment on issue #162.

My intention here is to point out some of the parts that a more experienced user might feel are obvious but aren't necessarily completely clear to a beginner. There also might be a little repetition as I feel some information should be shared where the user first encounters a concept even if it is explained in greater detail later.

I have only done 4 of the pages. I wanted to see if you felt it was useful first before trying to add more.

I hope that it is all at least factually correct but as I am new, I might be wrong about some things.

I hope it is helpful,
Michael