Revert "Delete fizzbuzz.rb"

This reverts commit 29e384491005cc5f5ed1a2ab34699a40ea49f80d.
Revert "Delete choose_your_own.rb"

This reverts commit 64a97934be83100f3e539685e1903fc151dada7d.
Revert "Delete RubyCipher.rb"

This reverts commit 972800a83635a43043ee9d5ebe69db7b06dda69f.