[Tile-serving] [osm2pgsql] Add a readme fo contributors (#376)

[Paul Norman]

cc @zerebubuth and @kevinkreiser since I'm adding their names to AUTHORS, both having significant number of commits.

Fixes #370
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/376

-- Commit Summary --

  * Add a readme fo contributors

-- File Changes --

    M AUTHORS (4)
    A CONTRIBUTING.md (102)
    M README.md (25)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/376.patch
https://github.com/openstreetmap/osm2pgsql/pull/376.diff

---
Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/pull/376
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