Create a demo website for ompparser

[ouankou]

A demo website like http://demo.rosecompiler.org/ can be created. Users can input the OpenMP code manually or upload a source code file for testing. An unparsed string or DOT file can be generated to the user.

A docker microservice could be considered to represent this demo. For now, a personal server will be used for demo development. Later on, a public demo will be deployed to the PASSLAB server or ROSE demo server.