added importer from google analytics to index export

example/metrics.js

@@ -0,0 +1,21 @@
+const importer = require('../lib/index').importer
+    path = require('path')
+
+const email = 'your email' //email account from the user credentials
+    keyPath = path.join(__dirname, 'your credentials')// path to credentials json or pem
+    config = {
+    viewId: "some viewId",//the view id to query
+    daterange:{
+        "endDate":"2017-06-30",
+        "startDate":"2016-06-30"
+      },
+      metrics: "ga:users",
+      dimensions: "ga:date"
+    }
+
+const example = async () => {
+    const result = await importer(email, keyPath, config)
+    console.log(JSON.stringify(result.data))
+}
+
+example()

lib/index.js

@@ -1 +1,4 @@
-module.exports = {}
+const importer = require('./importer')
+
+module.exports = { importer }
+

test/lib/index-test.js

@@ -0,0 +1,10 @@
+jest.mock('../../lib/importer', () => jest.fn())
+
+const index = require('../../lib/index')
+    importer = require('../../lib/importer')
+
+describe('index', () => {
+    it('exports the importer',async () => {
+        expect(index.importer).toBe(importer)
+    })
+})