Add readme

Author: dennisbruner

README.md

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+# vue-native-notification
+
+Vue.js plugin for native notifications
+
+## Install
+
+```
+npm install --save vue-native-notification
+```
+
+## Usage
+
+### Add plugin
+
+```javascript
+import Vue from 'vue'
+import VueNativeNotification from 'vue-native-notification'
+
+Vue.use(VueNativeNotification, {
+  // Automatic permiossion request before
+  // showing notification (default: true)
+  requestOnNotify: true
+})
+```
+
+### Show notification
+
+```html
+<template>
+  <button type="button" @click="notify">Show notification</button>
+</template>
+
+<script>
+export default {
+  methods: {
+    notify () {
+      // https://developer.mozilla.org/en-US/docs/Web/API/Notification/Notification#Parameters
+      this.$notification.show('Hello World', {
+        body: 'This is an example!'
+      })
+    }
+  }
+}
+</script>
+
+<style>
+</style>
+```
+
+### Manual permission request
+
+You can manually request users permission with:
+
+```javascript
+// Global
+Vue.notification.requestPermission()
+  .then(console.log) // Prints "granted", "denied" or "default"
+
+// Component
+this.$notification.requestPermission()
+  .then(console.log)
+```
+
+## License
+
+[MIT](LICENSE.md)