Added README file

Change-Id: I56599d9d125a1705f7a0a540e0ed1fd4e055bf59
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/README.rst b/README.rst
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+===========
+osm-im
+===========
+
+osm-im is the Information Model package for OSM, providing base classes
+derived from YANG models to be used by other modules.
+