Added some documentation

doc/extending.md

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+Extending Monolog
+=================
+
+Monolog is fully extendable, allowing you to adapt your logger to your needs.
+
+Writing your own handler
+------------------------
+
+Monolog provides many built-in handlers. But if the one you need does not
+exist, you can write it and use it in your logger. The only requirement is
+to implement `Monolog\Handler\HandlerInterface`.
+
+Let's write a PDOHandler to log records to a database. We will extend the
+abstract class provided by Monolog to keep things DRY.
+
+```php
+<?php
+
+use Monolog\Logger;
+use Monolog\Handler\AbstractProcessingHandler;
+
+class PDOHandler extends AbstractProcessingHandler
+{
+    private $initialized = false;
+    private $pdo;
+    private $statement;
+
+    public function __construct(PDO $pdo, $level = Logger::DEBUG, $bubble = true)
+    {
+        $this->pdo = $pdo;
+        parent::__construct($level, $bubble);
+    }
+
+    protected function write(array $record)
+    {
+        if (!$this->initialized) {
+            $this->initialize();
+        }
+
+        $this->statement->execute(array(
+            'channel' => $record['channel'],
+            'level' => $record['level'],
+            'message' => $record['formatted'],
+            'time' => $record['datetime']->format('U'),
+        ));
+    }
+
+    private function initialize()
+    {
+        $this->pdo->exec('CREATE TABLE IF NOT EXISTS monolog (channel VARCHAR(255), level INTEGER, message LONGTEXT, time INTEGER UNSIGNED)');
+        $this->statement = $this->pdo->prepare('INSERT INTO monolog (channel, level, message, time) VALUES (:channel, :level, :message, :time)');
+    }
+}
+```
+
+You can now use this handler in your logger:
+
+```php
+<?php
+
+$logger->pushHandler(new PDOHandler(new PDO('sqlite:logs.sqlite'));
+
+// You can now use your logger
+$logger->addInfo('My logger is now ready');
+```
+
+The `Monolog\Handler\AbstractProcessingHandler` class provides most of the
+logic needed for the handler, including the use of processors and the formatting
+of the record (which is why we use ``$record['formatted']`` instead of ``$record['message']``.

doc/usage.md

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+Using Monolog
+=============
+
+Installation
+------------
+
+To install Monolog, simply get the code (from github or through PEAR) and
+configure an autoloader for the Monolog namespace.
+
+Monolog does not provide its own autoloader but follows the PSR-0 convention,
+thus allowing to use any compliant autoloader. You could for instance use
+the [Symfony2 ClassLoader component](https://github.com/symfony/ClassLoader).
+
+Configuring a logger
+--------------------
+
+Here is a basic setup to log to a file and to firephp on the DEBUG level:
+
+```php
+<?php
+
+use Monolog\Logger;
+use Monolog\Handler\StreamHandler;
+use Monolog\Handler\FirePHPHandler;
+
+// Create the logger
+$logger = new Logger('my_logger');
+// Now add some handlers
+$logger->pushHandler(new StreamHandler(__DIR__.'/my_app.log', Logger::DEBUG));
+$logger->pushHandler(new FirePHPHandler());
+
+// You can now use your logger
+$logger->addInfo('My logger is now ready');
+```
+
+Let's explain it. The first step is to create the logger instance which will
+be used in your code. The argument is a channel name, which is useful when
+you use several loggers (see below for more details about it).
+
+The logger itself does not know how to handle a record. It delegates it to
+some handlers. The code above registers two handlers in the stack to allow
+handling records in two different ways.
+
+Note that the FirePHPHandler is called first as it is added on top of the
+stack.
+
+Adding extra data in the records
+--------------------------------
+
+Monolog provides two different ways to add extra informations along the simple
+textual message.
+
+The first one is the context, allowing to pass an array of data along the
+record:
+
+```php
+<?php
+
+$logger->addInfo('Adding a new user', array('username' => 'Seldaek'));
+```
+
+Simple handlers (like the StreamHandler for instance) will simply format
+the array to a string but richer handlers can take advantage of the context
+(FirePHP is able to display arrays in pretty way for instance).
+
+The second way is to add extra data for all records by using a processor.
+Processors can be any callable. They will get the record as parameter and
+must return it after having eventually changed the `extra` part of it. Let's
+write a processor adding some dummy data in the record:
+
+```php
+<?php
+
+$logger->pushProcessor(function($record){
+    $record['extra']['dummy'] = 'Hello world!';
+
+    return $record;
+});
+```
+
+Monolog provides some built-in processors that can be used in your project.
+Look at the README file for the list.
+
+> Tip: processors can also be registered on a specific handler instead of
+  the logger to apply only for this handler.
+
+Leveraging channels
+-------------------
+
+Channels are a great way to identify to which part of the application a record
+is related. This is useful in big application (and is leveraged by MonologBundle
+in Symfony2).
+Using different loggers with the same handlers allow to identify the logger
+that issued the record (through the channel name) by keeping the same handlers
+(for instance to use a single log file).
+
+```php
+<?php
+
+use Monolog\Logger;
+use Monolog\Handler\StreamHandler;
+use Monolog\Handler\FirePHPHandler;
+
+// Create some handlers
+$stream = new StreamHandler(__DIR__.'/my_app.log', Logger::DEBUG);
+$firephp = new FirePHPHandler();
+
+// Create the main logger of the app
+$logger = new Logger('my_logger');
+$logger->pushHandler($stream);
+$logger->pushHandler($firephp);
+
+// Create a logger for the security-related stuff with a different channel
+$securityLogger = new Logger('security');
+$securityLogger->pushHandler($stream);
+$securityLogger->pushHandler($firephp);
+```