Updates README.md for V 2.0

Author: Sergio Cruz Moral

README.md

@@ -1,3 +1,14 @@
-### Shell Script for importing geonames.org data dumps into a MySQL database.
+### V 2.0 Shell Script for importing geonames.org data dumps into a MySQL database.
 
+Usage: geonames_importer.sh -a "action"
+
+Where "action" can be: 
+  
+- **download-data** Downloads the last packages of data available in GeoNames. An additional parameter with a download directory should be used.
+- **create-db** Creates the mysql database structure with no data.
+- **create-tables** Creates the tables in the current database. Useful if we want to import them in an exsiting db.
+- **import-dumps** Imports geonames data into db. A database is previously needed for this to work.
+- **drop-db** Removes the db completely.
+- **truncate-db** Removes geonames data from db.
+    
 Please, visit the <a href="http://codigofuerte.github.com/GeoNames-MySQL-DataImport" target="_blank">project's web site</a> for a more detailed information.