Add vue integration readme

docs/VueJsIntegration.md

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+# Vue.js Integration in Yii2
+
+## Plugin application integration
+
+Add 'antkaz/yii2-vue' plugin to your ``composer.json`` file :
+```bash
+composer require antkaz/yii2-vue  --ignore-platform-reqs
+```
+
+## View file  integration
+
+Add this following code at the beginning of php view files  :
+```php
+use antkaz\vue\VueAsset;
+VueAsset::register($this);
+```
+Now you can add Vue.js (v2) applications and components inside of your php view files.
+
+## Running example
+
+Add this code to your view file to test if Vue.js is working well.
+
+Example :
+```html
+<div id='app'>
+  <h1>Trying out Vue.js</h1>
+ <p>{{ message }}</p>
+  <button v-on:click="reverseMessage">Reverse Message</button>
+</div>
+
+<script>
+new Vue({
+  el: '#app',
+  data: {
+    message: "OpenSILEX is awesome!"
+  },
+  methods: {
+    reverseMessage: function() {
+      this.message = this.message.split('').reverse().join('')
+    }
+  }
+})
+</script>
+```
+
+## Add Vue;js plugins
+
+If you want to add Vue.js plugins, you need to register the
+js and css file of this plugin using the function
+```php
+$this->registerJsFile("{url of plugin Vue.js js file}");
+$this->registerCssFile("{url of plugin Vue.js css file}");
+```