[Tile-serving] [osm2pgsql] Create README_lua.md (#82)

[Richard Fairhurst]

Lua documentation as requested.
You can merge this Pull Request by running:

  git pull https://github.com/systemed/osm2pgsql patch-1

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

  https://github.com/openstreetmap/osm2pgsql/pull/82

-- Commit Summary --

  * Create README_lua.md

-- File Changes --

    A README_lua.md (57)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/82.patch
https://github.com/openstreetmap/osm2pgsql/pull/82.diff
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