Added create-hibernate-cfg-xml in references to fix #302

src/en/ref/Command Line/create-hibernate-cfg-xml.gdoc

@@ -0,0 +1,23 @@
+h3. Purpose
+
+The create-hibernate-cfg-xml command will create a hibernate.cfg.xml file for custom Hibernate mappings.
+
+h3. Examples
+
+{code}
+grails create-hibernate-cfg-xml
+{code}
+
+h3. Description
+
+Creates a hibernate.cfg.xml file in the grails-app/conf/hibernate directory. You can add <mapping> elements there to reference annotated Java domain classes, classes mapped by hbm.xml files, or hbm.xml files containing <database-object> elements defining custom DDL that's not supported by GORM.
+
+Usage:
+
+{code}
+grails create-hibernate-cfg-xml
+{code}
+
+Fired Events:
+
+* CreatedFile - When the file is created