[Tile-serving] [osm2pgsql] Add example osm2pgsql usage (#42)

[pnorman]

The example osm2pgsql usage is for a full planet and based on reasonable defaults for rendering osm-carto.

The example will periodically require updating to increase the RAM cache and quoted flat nodes size.

Also, be clearer about supporting PBF.
You can merge this Pull Request by running:

  git pull https://github.com/pnorman/osm2pgsql example_help

Or you can view, comment on it, or merge it online at:

  https://github.com/openstreetmap/osm2pgsql/pull/42

-- Commit Summary --

  * Add example osm2pgsql usage

-- File Changes --

    M osm2pgsql.c (19)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/42.patch
https://github.com/openstreetmap/osm2pgsql/pull/42.diff

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