Created README file

Author: simmatrix

README.md

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+# vue-google-auth
+Handling Google sign-in and sign-out for Vue.js applications
+
+## Installation
+`npm install simmatrix/vue-google-auth`
+
+## Initialization
+```
+import GoogleAuth from 'vue-google-auth'
+
+Vue.use(GoogleAuth, { clientID: 'xxxxxxxxxx-xxxxxxxxxxxxxxxxxxxxxxxxxx.apps.googleusercontent.com' })
+Vue.googleAuth().load()
+```
+Ideally you shall put in this in your main file, e.g. main.js
+
+## Usage
+Handling Google sign-in, this is added within the login page
+```
+import Vue from 'vue'
+
+Vue.googleAuth().signIn(function () { 
+  // things to do when sign-in succeeds
+}, function () {
+  // things to do when sign-in fails
+))
+```
+
+Handling Google sign-out
+```
+import Vue from 'vue'
+
+Vue.googleAuth().signOut(function () { 
+  // things to do when sign-out succeeds
+}, function () {
+  // things to do when sign-out fails
+))
+```