Add READMD.md for monolog addon

monolog/README.md

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+# Monolog Addon
+
+A Logging framework with lots of additions (see [Monolog](https://github.com/Seldaek/monolog/)). There are just Friendica additions inside the src directory.
+
+Set `system.logger_config` to `monolog` in your `config/local.config.php` file to activate Monolog.
+
+```
+// in config/local.config.php
+// ...
+    'system' => [
+        'logger_config' => 'monolog',
+    ]
+// ...
+```