adding more info on caesarcipher.py and reversecipher.py

[deepti0011]

22 Caesar Cipher Technique is the simple and easy method of encryption technique.

It is simple type of substitution cipher.

Each letter of plain text is replaced by a letter with some fixed number of positions down with alphabet.

21 Reverse Cipher uses a pattern of reversing the string of plain text to convert as cipher text.

The process of encryption and decryption is same.

To decrypt cipher text, the user simply needs to reverse the cipher text to get the plain text.

[deepti0011]

added more info on how these algorithms work