add demo

demo/get-friend-online-status.js

@@ -0,0 +1,20 @@
+"use strict"
+try {
+	var { createClient, core } = require("../lib")
+} catch {
+	var { createClient, core } = require("oicq")
+}
+const jce = core.jce
+
+const client = createClient(147258369)
+client.login()
+
+client.on("system.online", async function () {
+	const FSOLREQ = jce.encodeStruct([
+		this.uin, 0, 0, null, 1, 31, 0
+	])
+	const body = jce.encodeWrapper({ FSOLREQ }, "mqq.IMService.FriendListServiceServantObj", "GetSimpleOnlineFriendInfoReq")
+	const payload = await this.sendUni("friendlist.GetSimpleOnlineFriendInfoReq", body)
+	const rsp = jce.decodeWrapper(payload)[1]
+	console.log("我的好友在线状态:", rsp)
+})