Added README doc.

Renamed example/roc_api to demo.
Added contracts

examples/demo/launcher/default/application_launcher.e

@@ -0,0 +1,19 @@
+note
+	description: "[
+				Effective class for APPLICATION_LAUNCHER_I
+
+				You can put modification in this class
+			]"
+	date: "$Date: 2013-06-12 13:55:42 +0200 (mer., 12 juin 2013) $"
+	revision: "$Revision: 36 $"
+
+class
+	APPLICATION_LAUNCHER
+
+inherit
+	APPLICATION_LAUNCHER_I
+
+feature -- Custom
+
+end
+

examples/demo/launcher/default/application_launcher_i.e

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+note
+	description: "[
+			Specific application launcher
+
+			DO NOT EDIT THIS CLASS
+
+			you can customize APPLICATION_LAUNCHER
+		]"
+	date: "$Date: 2013-06-12 13:55:42 +0200 (mer., 12 juin 2013) $"
+	revision: "$Revision: 36 $"
+
+deferred class
+	APPLICATION_LAUNCHER_I
+
+feature -- Execution
+
+	launch (a_service: WSF_SERVICE; opts: detachable WSF_SERVICE_LAUNCHER_OPTIONS)
+		local
+			launcher: WSF_SERVICE_LAUNCHER
+		do
+			create {WSF_DEFAULT_SERVICE_LAUNCHER} launcher.make_and_launch (a_service, opts)
+		end
+
+end
+
+