Not fully clear instructions in simple_cypher

[AstraBert]

Hello!
First of all, thanks for the amazing product, I'm using it to learn Go and I'm really happy with it.

Secondly, I would like to point out that the instructions in Simple Cypher are a little unclear, and maybe too fast in going through the different steps. It might be me not having a background in CS, but the explanation of how the Vigenere key works was not really clear and I wasn't sure of how to implement the code (as well as some other details here and there).
I have in mind some additions to make the instructions a little bit clearer (while keeping them short): can I work on that and open a PR? Thanks a lot :)

All the best,
Cle

[github-actions]

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