Fundamentals concept

[glennj]

Getting started with the AWK syllabus...

[glennj]

This is just the concept introduction. The learning exercise will come when we nail down the introductory materials.

[glennj]

I moved the sections around a bit, to introduce records before using them. Also, added a couple of more relevant examples.

Diff between about and introduction:

• mention that 0 is false but "0" is true
• comparisons to other standard tools.

[glennj]

I haven't thought much about the exercise yet. I'll have to come back to the introduction to show basic commands like print

[glennj]

On to the exercise ...

I plan to take some inspiration from the jq basics exercise, but it's still totally TBD

[glennj]

I botched the commit history a bit: forgot to rebase before I pushed.

Nevertheless, the last commit adds the exercise (and repairs config.json) without touching the concept docs.