Add OpenStreetMap data loading instructions

These are based on the ones for OpenStreetMap Carto
pnorman · May 28, 2017 · a9c4c74 · a9c4c74
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diff --git a/vector/README.md b/vector/README.md
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 This directory contains the definitions needed to generate the vector tiles
+
+## Installation
+
+You need OpenStreetMap data loaded into a PostGIS database with [osm2pgsql](https://github.com/openstreetmap/osm2pgsql) using the [OpenStreetMap Carto schema](https://github.com/gravitystorm/openstreetmap-carto/blob/master/INSTALL.md#openstreetmap-data)
+
+Start by setting up your database to have PostGIS and hstore with ``psql -d gis -c 'CREATE EXTENSION postgis; CREATE EXTENSION hstore;'``, then grab some OSM data. It's probably easiest to grab an PBF of OSM data from [Mapzen](https://mapzen.com/metro-extracts/) or [geofabrik](http://download.geofabrik.de/). Once you've done that, import with osm2pgsql:
+
+```
+osm2pgsql -G --hstore --style openstreetmap-carto.style --tag-transform-script openstreetmap-carto.lua -d gis ~/path/to/data.osm.pbf
+```