Add README

Author: Seldaek

README.md

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+MonologBundle
+=============
+
+The `MonologBundle` provides integration of the [Monolog](https://github.com/Seldaek/monolog)
+library into the Symfony2 framework.
+
+As of v2.4.0 of the bundle, the release cycle is de-synchronized from the framework's.
+It means you can just require `"symfony/monolog-bundle": "~2.4"` in your composer.json
+and Composer will automatically pick the latest version of the bundle that works with
+your current version of Symfony. The minimum version of Symfony2 for this workflow
+is 2.3.0.
+
+More information in the official [documentation](http://symfony.com/doc/current/cookbook/logging/index.html).