Add content for v-model (#6349)

add description & official documentation vue.js

src/data/roadmaps/vue/content/v-model@cxu2Wbt306SxM4JKQQqnL.md

@@ -1 +1,5 @@
-# v-model
+# v-model
+
+The v-model directive in Vue.js is used for creating two-way data bindings on form input elements, such as <input>, <textarea>, and <select>. This means that the data can be updated in the component when the user inputs something, and the UI will update if the data in the component changes.
+
+- [@article@Form Input Bindings](https://vuejs.org/guide/essentials/forms.html)