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## tell-it-cypher
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### Instructions
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FINALLY, you got the names.
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But you could forget it... loose it... How could you write it without puting the surprise in danger?!
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Create a `tell-it-cypher.mjs` script that:
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- Takes a file as first argument
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- Takes one of these keywords as second argument:
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- `encode`: convert your file to `base64`, then save the result in a `cypher.txt` file.
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- `decode`: convert your file from `base64`, then save the result in a `clear.txt` file.
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- Could take a string as third argument and use it as the new file name. Extension must be precised.
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### Notions
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- [Node buffer: `.from()`](https://nodejs.org/docs/latest/api/buffer.html#buffer_static_method_buffer_from_string_encoding)
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- [Node buffer: `.toString()`](https://nodejs.org/api/buffer.html#buffer_buf_tostring_encoding_start_end)
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