[openstreetmap-website] Add welcome page (#338)

[Eugene Alvin Villar]

> "Just go to the map and click 'Add a note' in the bottom-right corner. This will add a marker to the map, which you can move by dragging the green plus sign."

GIven the new Map UI, this description is no longer correct.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/338#issuecomment-21272929
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