updated documentation on how to use

README.md

@@ -25,4 +25,15 @@ This script does the following:
 - upload all the dependencies jar by checking in the pom those preceded by comment `<!-- JAR NEED -->`
 - submit the spark-job and you can watch the output log directly on your machine
 
+
+## Class convention
+
+To create a new scala Class Spark, you need to extend the _AbstractScalaApplication_ on package `com.sandro.app`
+Implements the method `run` where you have already the spark context initialized.
+
+Then define a Singleton object NameOfTheClass and in the main methods you run the code:
+
+`new YOURCLASS(args,logger).initialize().run()`
+
+
 That's AWESOME!