Caeser-Cipher

Project Brief:

The aim of this project is to create a JavaScript encoding / decoding web app using the Caesar cipher and an HTML user interface.

The app should:

1. Accept user input of plain text or coded message.
2. Accept user input of the required key.
3. Accept user input for choice of encode or decode.
4. Given a coded message, the choice of key and choice of decode - produce decoded plain text (decoded using the chosen key).
5. Given a plan test message, the choice of key and choice of encode - produced coded message (encoded using the chosen key).