Add Railfence/Zig-Zag cracker

[lukasgabriel]

Hello spoooopyyy hackers :jack_o_lantern:

This is a Hacktoberfest only issue! :ghost:

Find our contributing guidelines here, this walks you through how to add a decoder / cracker! https://github.com/Ciphey/Ciphey/wiki#adding-your-own-crackers--decoders

Don't worry if it looks hard, we will walk you through everything! :)

Write this issue in C++!

Links

These links will help you understand how this works!

https://en.wikipedia.org/wiki/Rail_fence_cipher https://crypto.interactive-maths.com/rail-fence-cipher.html https://www.dcode.fr/rail-fence-cipher

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[Snails-Of-Wrath]

I plan on taking this as my first project here. What would be the amount of iterations I am limited to keep performance smooth?

[SkeletalDemise]

I'm working on this with @Mr-Salme. They will add detailed documentation on how to add a C++ cracker after I complete it.

[AlexandruValeanu]

Hi @lukasgabriel and @bee-san,

I've noticed that this was not implemented last year so I decided to give it a go (https://github.com/Ciphey/Ciphey/pull/699). Let me know what you think.