[README] Added 'Project Structure' and 'Where to start reading the code?' sections
[README] Added 'Project Structure' and 'Where to start reading the code?' sections

millen1m/flask-restplus-server-example,millen1m/flask-restplus-server-example,frol/flask-restplus-server-example,millen1m/flask-restplus-server-example,frol/flask-restplus-server-example