Add script of example for existing main search

I think this would be useful if someone (like me) trying to do something (tuning, fixing or improving) search result on MetaCPAN search. Playing and understanding existing query will help to know where could make it  better. This is not exactly the same with query but I edited from the [one that I've got from Thomas] (https://gist.github.com/tsibley/863fc6ae99cd2bce151c) but the result still look almost the same.