Implement example: 7GUIs CRUD

[tbreuss]

The implementation must be integrated in this Markdown file:

• https://github.com/tbreuss/mithril-by-examples/blob/main/examples/7gui-crud.md

And the content should be formatted like here for example:

• https://github.com/tbreuss/mithril-by-examples/blob/main/examples/routing.md

If you have any question, leave a message in the comments.

[ColinFrick]

I'd like to work on this

[tbreuss]

I'd like to work on this

Great! I assign you later.

Please note, that the implementation should be placed within the above markdown file.
Your content will then be "compiled" and built, and in the end referenced to Flems via an automatically generated link button.
You can see a working example here: https://mithril-by-examples.tebe.ch/examples/modal/
The website is in work-in-progress and should be released end of october.

It would be nice when you could code in ES6.

If you have any question on that, let me know.