Add guideline docs for creating new dialects #36

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1. h4v0kh3l1

   self-assigned this

   on May 8, 2018
2. dlthomas commented on May 9, 2018

   

   dlthomas

   on May 9, 2018

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   @etrabelsi In response to @h4v0kh3l1's comment (#32 (comment)):

   That sounds about right. There's also the option of working from the grammar for the dialect, if you have it, as Matt did for Presto.

   With either approach, I'd like to stress the importance of having a corpus of valid queries - the bigger the better.