Update usage

usage

@@ -22,4 +22,8 @@ bot_msg3 = {"text": "Here is a video clip of the world",
 conversation = [[user_msg1, bot_msg1], [user_msg2, bot_msg2], [user_msg3, bot_msg3]]
 
 with gr.Blocks() as demo:
-    MultimodalChatbot(value=conversation, height=800)
+    MultimodalChatbot(value=conversation, height=800)
+
+    
+if __name__ == "__main__":
+    demo.launch()