Add README

README.md

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+# Web Push example in PHP
+
+Navigating through the commits and files will help you build:
+- on the client
+    - a user friendly opt-in push notification button
+- on the server
+    - an endpoint for managing your push notification subscriptions
+    - an endpoint that triggers push notification
+
+## Requirements
+- Chrome or Firefox
+- PHP 5.6+
+    - gmp
+    - mbstring
+    - curl
+    - openssl
+
+## Installation
+```bash
+$ composer install minishlink/web-push-php-example
+```
+
+## Usage
+
+```bash
+$ php -S localhost:8000 router.php
+```
+
+And open [http://localhost:8000](localhost:8000).