Add a simple example for the CSV block

[bobbingwide]

Block examples are provided for quite a few of the core blocks. It would be nice to have a simple example of the CSV block.

Requirement

• Provide an example for the CSV block

Solution

• [x] Implement a simple example.

A,B,C
1,2,3
4,5,6

• [ ] Just using letters and numbers means it doesn't really need to be translatable.

[bobbingwide]

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