Create fr.json

here is a base for the French version. Not sure for the translation of 'item' to 'article' tough.
Merge pull request #2 from maxlath/patch-1

Create fr.json. Thanks for the translations. You might also want to translate the question/answer patterns in the patterns folder. Just noting, the standard translation for "item" is "élément". https://www.wikidata.org/wiki/MediaWiki:Special-newitem/fr