[openstreetmap-website] Add a paragraph on the rules in OSM or the lack of them. (#993)

[simonpoole]

et voilà!
![welcome_rules](https://cloud.githubusercontent.com/assets/1011860/8161300/58515554-1376-11e5-8b17-f0062e4bc47c.png)


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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/993#issuecomment-112078450
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