move installation instructions from wiki page here

README.md

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+Nominatim
+=========
+
+Nominatim (from the Latin, 'by name') is a tool to search OpenStreetMap data
+by name and address (geocoding) and to generate synthetic addresses of
+OSM points (reverse geocoding). An instance with up-to-date data can be found
+at http://nominatim.openstreetmap.org. Nominatim is also used as one of the
+sources for the Search box on the OpenStreetMap home page and powers the search
+on the MapQuest Open Initiative websites.
+
+Documentation
+=============
+
+More information about Nominatim, including usage and installation instructions,
+can be found in the docs/ subdirectory and in the OSM wiki at:
+
+http://wiki.openstreetmap.org/wiki/Nominatim
+
+Installation
+============
+
+There are detailed installation instructions in the /docs directory.
+Here is a quick summary of the necessary steps.
+
+1. Compile Nominatim:
+
+     mkdir build
+     cd build
+     cmake ..
+     make
+
+   For more detailed installation instructions see [docs/installation.md]().
+   There are also step-by-step instructions for
+     [Ubuntu 16.04](docs/install-on-ubuntu-16.md) and
+     [CentOS 7.2](docs/install-on-centos-7.md).
+
+2. Get OSM data and import:
+
+     ./build/utils/setup.php --osm-file <your planet file> --all
+
+   Details can be found in [docs/Import_and_update.md]()
+
+3. Point your webserver to the ./build/website directory.
+
+
+
+License
+=======
+
+The source code is available under a GPLv2 license.
+
+Contact and Bugreports
+======================
+
+For questions you can join the geocoding mailinglist, see
+http://lists.openstreetmap.org/listinfo/geocoding
+
+Bugs may be reported on the github project site:
+https://github.com/twain47/Nominatim