update README.md to handle app initialisation

Author: GeoXd

README.md

@@ -37,6 +37,14 @@ $ export ADMIN_GENERATE_DATA=True           # Creates minimal test data
 $ export DEFAULT_TEST_ACCOUNT_LOGIN=True    # Disables end-user authentication   
 ~~~
 
+Initialise App
+~~~
+from application import create_app
+app = create_app()
+from app.initialise import initialise
+initialise(app)
+~~~
+
 Run Flask
 ~~~
 $ export FLASK_APPLICATION="application.py"