docs: cdn installation

Author: SasanFarrokh

docs/guide/installation.md

@@ -51,6 +51,9 @@ look sample above.
 ```html
 <script src="https://cdnjs.cloudflare.com/ajax/libs/axios/0.19.2/axios.min.js"></script>
 <script src="https://unpkg.com/vue-chimera@latest/dist/vue-chimera.min.js"></script>
+<script>
+Vue.use(VueChimera)
+</script>
 ```
 If you use old browser style and `Vue` is publicly exposed as global variable
 just add `dist/vue-chimera.min.js` script tag to your HTML file and everything would be fine to go on.