Caesar Cipher

A Caesar cipher is a cipher that encodes a message by shifting the alphabet by a certain amount of letters.
For example, if the cipher had a shift of 1 the alphabet would look like:
A B C D E F G H I
Z A B C D E F G H

So if the message was: "Cipher, not salad", and the cipher used a shift of 5:
The encoded message would be: "Hnumjw, sty xfqfi"

Caesar ciphers are easy to solve by hand and are extremely simple.