Added more content to the tutorial

examples/tutorial/step_2/hello/src/hello_application.e

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+note
+	description: "[
+				This class implements the `Hello World' service.
+
+				It inherits from WSF_DEFAULT_RESPONSE_SERVICE to get default EWF connector ready
+				only `response' needs to be implemented.
+				In this example, it is redefined and specialized to be WSF_PAGE_RESPONSE
+
+				`initialize' can be redefine to provide custom options if needed.
+
+			]"
+
+class
+	HELLO_APPLICATION
+
+inherit
+	WSF_DEFAULT_RESPONSE_SERVICE
+
+create
+	make_and_launch
+
+feature {NONE} -- Initialization
+
+	response (req: WSF_REQUEST): WSF_PAGE_RESPONSE
+			-- Computed response message.
+		do
+			create Result.make
+			Result.put_string ("Hello World")
+		end
+
+end