issue 144 - defining easy to read

The issue is we use : "easy to read" but you do not define it and you do
not explain how to make it.

I suggest we add it as an "also know as " alternative for "easy reading".

We can also add to the definition "See patterns for objective 3
<https://www.w3.org/TR/coga-usable/#objective-3-use-clear-and-understandable-content-0>"
for more information.

(they suggest linking to ISO, but who knows when that will be )

all the best
Lisa