add support of meta parameters on meeting creating

Add support of meta parameters on meeting creating, in README add example of meta usage and link to BBB API documentation.

README.md

@@ -61,6 +61,11 @@ Add a meeting:
         'logoutURL' => 'https://example.org/',
         'record' => true,
         'autoStartRecording' => true,
+        'meta'  => [
+            'bn-recording-ready-url' => urlencode(https://example.com/api/v1/recording_status),
+            'presenter' => 'John Smith',
+        ],
+        //any other parameters from [BBB API Documentation](https://docs.bigbluebutton.org/dev/api.html#create)
     ]);
 
 Get meeting join URL for a moderator:
@@ -112,6 +117,11 @@ Copy this to a file called 'index.php', adjust the '$url' and '$secret' variable
         'logoutURL' => 'https://example.org/',
         'record' => true,
         'autoStartRecording' => true,
+        'meta'  => [
+            'bn-recording-ready-url' => urlencode(https://example.com/api/v1/recording_status),
+            'presenter' => 'John Smith',
+        ],
+        //any other parameters from [BBB API Documentation](https://docs.bigbluebutton.org/dev/api.html#create)
     ]);
     print '<pre>' . print_r($meeting, true) . "</pre>\n\n";
 

src/BigBlueButton/Member/Meeting.php

@@ -1300,7 +1300,7 @@ public function setClient(Client $client)
      */
     public function create()
     {
-        $response = $this->client->get('create', [
+        $parameters = [
           'name' => $this->getName(),
           'meetingID' => $this->getMeetingID(),
           'attendeePW' => $this->getAttendeePW(),
@@ -1328,7 +1328,13 @@ public function create()
           'lockSettingsLockedLayout' => $this->getLockSettingsLockedLayout(),
           'lockSettingsLockOnJoin' => $this->getLockSettingsLockOnJoin(),
           'lockSettingsLockOnJoinConfigurable' => $this->getLockSettingsLockOnJoinConfigurable(),
-        ]);
+        ];
+
+        foreach($this->getMetadata() as $key=>$value){
+            $parameters["meta_$key"] = $value;
+        }
+
+        $response = $this->client->get('create', $parameters);
         $this->meetingID = $response->meetingID;
         return $this->getInfo();
     }