add an initial home page for maps.altusmetrum.org

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+# Altus Metrum Map Service #
+
+This is the home of the [Altus Metrum](https://altusmetrum.org) map service.
+
+---
+
+This site is powered by [ikiwiki](http://ikiwiki.info), 
+and hosted by [Garbee and Garbee](http://www.gag.com)
+using [Debian GNU/Linux](http://www.debian.org) 
+and [Apache](http://www.apache.org).
+