image for for Caesar-Cipher added

Author: PAPERPANKS

README.md

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 ### Caesar-Cipher
 
+![Caesar-Cipher](http://www.donatantonio.net/blog/wp-content/uploads/2010/10/cesare-570x355.png)
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 A cipher is a secret code for a language. In this study, we will explore a cipher that is reported by contemporary Greek historians to have been used by Julius Caesar to send secret messages to generals during times of war.
 
 The Caesar cipher, also known as a shift cipher, is one of the simplest forms of encryption. It is a substitution cipher where each letter in the original message (called the plaintext) is replaced with a letter corresponding to a certain number of letters up or down in the alphabet.