Add Introduction to D06

[Aut0R3V]

I felt like there could be a little bit of work done here. Please add in any comments of changes. I'll add in more stuff soon if PR's are accepted here.

[Aut0R3V]

@drwetter @wurstbrot

[drwetter]

Hi @Aut0R3V ,

thanks!

The introductory section though should rather give a broad with an overview. Also I would like to avoid the term 'docker secrets' here as it was/is used in correlation with docker swarm. Also docker swarm is listed specifically there.

So everybody else not using docker swarm will scratch their heads what this will be about.

The first paragraph should contain as a very first thing a definition what a secret is. Also it's not only about keys or certificates about secure transmission. The transmission can also be clear text, also when it maybe discouraged from using it. E.g. as a matter of fact, often it -- when using a DB connector.

I'll try to make a counter suggestion (=PR) the next few days.

[Aut0R3V]

@drwetter actually I wanted to know if PR's are being accepted. I can add a proper introduction with the added comments. I'd also like to work on the other sections in D06.

[drwetter]

To add: The introductory section should always be high level. If we start with low level tech stuff there we loose people upfront

[Aut0R3V]

Sure thanks! I'll send in a commit soon.

[drwetter]

PR #38 is not superb but it's definitely closer to what I think it should be like. So I am closing this one.

Feel free comment on #38 or send in PRs to the d06_intro branch