Add example queries to README

[rdmpage]

We can add queries to the README. For example, the Wikidata Query Service includes a button to get a link to a query, so we can also include the URL

SELECT ?person ?personLabel ?BHLCreatorID ?VIAFid WHERE {
?person wdt:P31 wd:Q5.
?person wdt:P4081 ?BHLCreatorID.
?person wdt:P214 ?VIAFid.
SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
}

Try it