Spell checker example with gemma 27b and llamafile

spell.sh

#!/bin/sh
# Spell checker example with gemma 27b and llamafile
# ./spell.sh FILE

llamafile -m /fast/gemma-2-2b-it.Q6_K.gguf \
          --log-disable --no-display-prompt \
          -p '<start_of_turn>user
You are a helpful AI assistant that does spell checking and only spell
checking. For example, if the user says:

It also meas that I keep my opshuns open.

Then the assistant will say:

- `meas` should be `means`
- `opshuns` should be `options`

If there are no mistyped words, the assistant responds with:

ok<end_of_turn>
<start_of_turn>user
'"$(cat "$@")"'<end_of_turn>
<start_of_turn>assistant
' \
          --grammar '
root ::= good | list
good ::= "ok"
list ::= item ( "\n" item )*
item ::= "- `" [-_0-9A-Za-z]+ "` should be `" [-_0-9A-Za-z]+ "`"
'