Update README.md

Author: karpy47

README.md

@@ -1,2 +1,49 @@
 # php-mqtt-client
-MQTT v3.1 client in PHP
+MQTT 3.1.1 Client with SSL support in PHP
+
+# Installation
+
+The preferred way to install this extension is through [composer](http://getcomposer.org/download/).
+
+Either run
+
+    php composer.phar require --prefer-dist karpy47/php-mqtt-client
+
+or add
+
+    "karpy47/php-mqtt-client": "*"
+
+to the require section of your composer.json.
+
+# Requirements
+
+Should work with all recent PHP versions.
+
+Code developed and running in production using PHP v5.6.27
+
+Not tested on PHP v7, please report back!
+
+# Basic Usage
+
+    $client = new MQTTClient('mqtt-server.domain.com', 8162);
+    $client->setAuthentication'mqtt-server.username','mqtt-server.password');
+    $client->setEncryption('cacerts.pem');
+    $success = $client->sendConnect(12345);  // set your client ID
+    if ($success) {
+        $client->sendSubscribe('topic1');
+        $client->sendPublish('topic2');
+        $messages = $client->getPublishMessages();
+        foreach ($messages as $message) {
+            echo $message['topic'] .': '. $message['message'] . PHP_EOL;
+        }
+        $client->sendDisconnect();    
+    }
+    $client->close();
+    
+# Credits
+
+Thanks to bluerhinos/phpMQTT and McFizh/libMQTT.
+
+# License
+
+Released under the MIT License.