Palindrome

[oliveiraigorm]

[chris-martin]

Thanks for the PRs. I think you might want to look at the content guidelines:

Each page of the Phrasebook demonstrates a particular thing that someone who doesn’t know Haskell might be wondering how to do.

Sometimes that means showing a feature of the language, sometimes that means how to achieve some practical task.

I think palindrome-related code is usually given for demonstration purposes, rather than being a practical task, so is there some particular feature of Haskell that we're demonstrating in this example? Unfortunately I think I'm having a hard time understanding the code because I can't read all of the words; getting it all into English might help, if possible.