chore: add docs site

docs/guide/README.md

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+# Preparing the plugin
+:::tip Note
+This step is optional if you don't need SSR and `Vue` is available as a global variable. `vue-meta` will install itself in this case.
+:::
+
+In order to use this plugin, you first need to pass it to `Vue.use` - if you're not rendering on the server-side, your JS entry file will suffice. If you are rendering on the server, then place it in a file that runs both on the server and on the client before your root instance is mounted. If you're using [`vue-router`](https://github.com/vuejs/vue-router), then your main `router.js` file is a good place:
+
+**router.js:**
+```js
+import Vue from 'vue'
+import Router from 'vue-router'
+import Meta from 'vue-meta'
+
+Vue.use(Router)
+Vue.use(Meta)
+
+export default new Router({
+  ...
+})
+```
+
+## Options
+
+`vue-meta` allows a few custom options:
+
+```js
+Vue.use(Meta, {
+  keyName: 'metaInfo',
+  attribute: 'data-vue-meta',
+  ssrAttribute: 'data-vue-meta-server-rendered',
+  tagIDKeyName: 'vmid',
+  refreshOnceOnNavigation: true
+})
+```
+
+See the [API](/api/#plugin-options) for a description of the available plugin options