Update the docs

docs/src/components/map.md

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+# Map
+
+## Install
+
+to install it via NPM 
+```bash
+npm install -S @fawmi/vue-google-maps
+```
+You can also install via Yarn
+```bash
+yarn add @fawmi/vue-google-maps
+```
+
+## Example
+Here is a basic example 
+
+```javascript
+import { createApp } from 'vue'
+import googleMap from '@fawmi/vue-google-maps'
+import App from './App.vue';
+
+const googleMapOption = {
+    apiKey: 'here_comes_your_api_key',
+}
+
+const app = createApp(App);
+
+app.use(googleMap, googleMapOption)
+app.mount('#app')
+
+```