upgrade version 2.0,add login api,upgrade api verison,add document and unit test

test/musicUrl.test.js

@@ -0,0 +1,34 @@
+const assert = require('assert')
+const crypto = require('crypto')
+const { createWebAPIRequest } = require("../util/util")
+const phone = "换成你的账号"
+const password = "换成你的密码"
+
+describe('测试获取歌曲是否正常', () => {
+  it('歌曲的 url 不应该为空', done => {
+    const id = 347230
+    const br = 999000
+    const data = {
+      "ids": [id],
+      "br": br,
+      "csrf_token": ""
+    }
+    const cookie = ''
+
+    createWebAPIRequest(
+      'music.163.com',
+      '/weapi/song/enhance/player/url',
+      'POST',
+      data,
+      cookie,
+      music_req => {
+        console.log(JSON.parse(music_req).data[0].url)
+        assert(!!JSON.parse(music_req).data[0].url)
+        done()
+      },
+      err => {
+        done(err)
+      }
+    )
+  })
+})