Suggested updates to the sample network readme

[mbwhite]

Therese are some suggested updates to make the overall 'flow' of the readme.md better. So it easier for Fred/Fiona to follow along.

Also added a way of 'cheating' if you been through the tutorial before, then just a quick recap of the commands is useful

Signed-off-by: mbw [email protected]

[mbwhite]

@jkneubuh I've updated the readme as per your suggestions...