Added documentation for the create-tables action.

Author: Sergio Cruz Moral

.gitignore

@@ -8,3 +8,5 @@ hierarchy.txt
 iso-languagecodes.txt
 no-country
 timeZones.txt
+/geonames_db_importer.sublime-project
+/geonames_db_importer.sublime-workspace

geonames_importer.sh

@@ -22,6 +22,7 @@ usage() {
     echo " Where <action> can be one of this: "
 	echo "    download-data Downloads the last packages of data available in GeoNames."
     echo "    create-db Creates the mysql database structure with no data."
+    echo "    create-tables Creates the tables in the current database. Useful if we want to import them in an exsiting db."
     echo "    import-dumps Imports geonames data into db. A database is previously needed for this to work."
 	echo "    drop-db Removes the db completely."
     echo "    truncate-db Removes geonames data from db."