Flexible Classroom integrate-flexible-classroom-fcr update

[SunGiantor]

url ：
https://docs.agora.io/en/flexible-classroom/develop/integrate-flexible-classroom/integrate-flexible-classroom-fcr?platform=web

please add sample code:

import { FcrUIScene } from 'fcr-ui-scene'
import {
FcrChatroom,
FcrBoardWidget,
FcrPollingWidget,
FcrStreamMediaPlayerWidget,
FcrWebviewWidget,
FcrCountdownWidget,
FcrPopupQuizWidget
} from 'agora-plugin-gallery/scene'

const unmount = FcrUIScene.launch(document.querySelector("#root"), {
appId: "Your App ID",
region: "NA",
userUuid: "user id",
userName: "user name",
roomUuid: "room id",
roomType: 4, // Room type: 4 is for small classes, currently only small classes are supported.
roomName: "room name",
pretest: true, // Whether to enable pre-class equipment detection
token: "rtm token", // In a test environment, you can use temporary RTM Token; in a production or security environment, it is strongly recommended that you use a server-generated RTM Token.
language: "zh",
duration: 60 * 30, // Course time in seconds.
recordUrl: "your record url",
userRole: 1, // User roles: 1 is teacher, 2 is student
widgets: {
easemobIM: FcrChatroom, // IM widget
netlessBoard: FcrBoardWidget, // Interactive whiteboard widget
poll: FcrPollingWidget, // Voter widget
mediaPlayer: FcrStreamMediaPlayerWidget, // Video sync player widget
webView: FcrWebviewWidget, // Embedded browser widget
countdownTimer: FcrCountdownWidget, // Countdown widget
popupQuiz: FcrPopupQuizWidget, // Clicker widget
},
});