update README.md

Author: mtak3

README.md

@@ -1,2 +1,27 @@
 # cakephp3-ip-filter
 restrict access by ip address for CakePHP3 Component
+
+## Installation
+
+You can install this plugin into your CakePHP application using [composer](http://getcomposer.org).
+
+The recommended way to install composer packages is:
+
+```
+composer require tyrellsys/cakephp3-ip-filter
+```
+
+## Configuration
+
+Controller::initialize
+```
+...
+        public function initialize($event)
+        {
+....
+            $this->loadComponent('Tyrellsys/CakePHP3IpFilter.IpFilter', [
+                'trustProxy' => true,
+                'whitelist' => '192.168.0.0/24' // array OR comma separate value
+            ]);
+...
+```