Update README.md

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@ -4,6 +4,8 @@ Implement the legendary caesar cipher:
> In cryptography, a Caesar cipher, also known as Caesar's cipher, the shift cipher, Caesar's code or Caesar shift, is one of the simplest and most widely known encryption techniques. It is a type of substitution cipher in which each letter in the plaintext is replaced by a letter some fixed number of positions down the alphabet. For example, with a left shift of 3, D would be replaced by A, E would become B, and so on. The method is named after Julius Caesar, who used it in his private correspondence.
Hint: You will need to convert letters to their corrosponding unicode values.
write a function that takes a string to be encoded and a shift factor and then returns the encoded string:
```javascript