增加歌手单曲和歌手专辑接口,修复/album 接口描述错误

router/artists.js

@@ -0,0 +1,20 @@
+const express = require("express")
+const router = express()
+const { createRequest } = require("../util/util")
+
+router.get("/", (req, res) => {
+  const id = req.query.id
+  const offset = req.query.offset || 0
+  const limit = req.query.limit || 50
+  createRequest(`/api/artist/${id}?offset=${offset}&limit=${limit}`, 'GET', null)
+    .then(result => {
+      res.setHeader("Content-Type", "application/json")
+      res.send(result)
+    })
+    .catch(err => {
+      res.status(502).send('fetch error')
+    })
+})
+
+
+module.exports = router