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Play Fair Cipher

The best-known multiple-letter encryption cipher is the Play fair, which treats diagrams
in the plaintext as single units and translates these units into ciphertext diagrams.3
The Playfair algorithm is based on the use of a 5 × 5 matrix of letters constructed
using a keyword. This cipher was actually invented by British scientist Sir Charles Wheatstone in 1854, but it bears the name of his friend Baron Playfair of St.Andrews, who championed the cipher at the British foreign office.

We had to create our own version of PlayFairCipher. I used Java as my Programming language and created this file PlayFairCipher.java . My Cipher's Key is "WORD". I used 'I' instead of 'J' and 'X' for inserting within double letters
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