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

[Tom Hughes]

Merged as cf8a20962b2045f11f7cea0873e0d9eccc1e1145.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/993#issuecomment-112509993
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