Add install using Nuxt.js

Author: ktquez

README.md

@@ -37,7 +37,30 @@ if (process.env.NODE_ENV !== 'production') {
 Optional: You can also pass settings through the second parameter at the time of installing the plugin, read about the object here:  
 https://github.com/dequelabs/axe-core/blob/master/doc/API.md#api-name-axeconfigure
 
----
+## Install in Nuxt.js
+Create plugin file `plugins/axe.js`
+```javascript
+import Vue from 'vue'
+import VueAxe from 'vue-axe'
+
+if (process.env.NODE_ENV !== 'production') {
+  Vue.use(VueAxe, {
+    config: {
+      // your configuration data
+    }
+  })
+  Vue.config.productionTip = false
+}
+
+```
+
+In config file `nuxt.config.js`
+```javascript
+...
+plugins: [
+  { src: '~/plugins/axe', ssr: false }
+]
+```
 
 ## Using with HTML files
 #### CDN 
@@ -55,8 +78,6 @@ Vue.use(VueAxe, {
 })
 ```
 
----
-
 ## Run the demo
 ```shell
 git clone https://github.com/vue-a11y/vue-axe.git vue-axe-demo
@@ -68,7 +89,6 @@ npm run dev
 It is a simple webpack template already installed and configured to run and check the logs in the browser console.  
 After the commands just access the http://localhost:8080/
 
----
 
 ## Run the tests
 ```shell
@@ -82,8 +102,6 @@ Or run Cypress on interactive mode
 npm run test:open
 ```
 
----
-
 ## Contributing
 - Check the open issues or open a new issue to start a discussion around your feature idea or the bug you found;
 - Fork repository, make changes and send a pull request;