added monolog demo

demo/bridge/monolog/composer.json

@@ -0,0 +1,5 @@
+{
+    "require": {
+        "monolog/monolog": "*"
+    }
+}

demo/bridge/monolog/index.php

@@ -0,0 +1,14 @@
+<?php
+
+include __DIR__ . '/vendor/autoload.php';
+include __DIR__ . '/../../bootstrap.php';
+
+$debugbarRenderer->setBaseUrl('../../../src/DebugBar/Resources');
+
+$logger = new Monolog\Logger('demo');
+
+$debugbar->addCollector(new DebugBar\Bridge\MonologCollector($logger));
+
+$logger->info('hello world');
+
+render_demo_page();

demo/index.php

@@ -32,6 +32,7 @@ render_demo_page(function() {
 <h2>Bridges</h2>
 <p>(you need to install needed dependencies first, run <code>composer.phar install</code> in each demo folders)</p>
 <ul>
+    <li><a href="bridge/monolog">Monolog</a></li>
     <li><a href="bridge/propel">Propel</a></li>
     <li><a href="bridge/swiftmailer">Swift mailer</a></li>
     <li><a href="bridge/twig">Twig</a></li>