Updated the DemoNotes.md with the instructions for a complete demo run

Author: jmMeessen

DemoNotes.md

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+# Demo notes
+
+- download the demo program with `git clone https://github.com/jmMeessen/SpringBootDemo.git demo` while being in data.
+
+- move to demo directory and launch compile with `mvn install` 
+
+- launch the demo server with the command `java -jar target/myproject-0.0.1-SNAPSHOT.jar`
+
+- start the X2GO client and launch the web browser. Point it to `http://localhost:8080`. It will display the message "Hello MIX-IT, Happy to be in Lyon"