add welcome message

app.py

@@ -27,6 +27,10 @@ last_msg = {}
 question = QAPair.query.with_entities(QAPair.question).all()
 questions = [a.question for a in question]
 
+@socketio.on('connect')
+def welcomeMessage():
+    send("hello there", broadcast = False)
+
 @socketio.on('message')
 def handleMessage(msg):