Adding documentation on how to enable param logging

README.md

@@ -100,7 +100,7 @@ class ApplicationController < ActionController::Base
 end
 ```
 
-To further clean up your logging, you can also tell Lograge to skip log messages 
+To further clean up your logging, you can also tell Lograge to skip log messages
 meeting given criteria.  You can skip log messages generated from certain controller
 actions, or you can write a custom handler to skip messages based on data in the log event:
 
@@ -220,6 +220,23 @@ Lograge doesn't yet log the request parameters. This is something I'm actively
 contemplating, mainly because I want to find a good way to include them, a way
 that fits in with the general spirit of the log output generated by Lograge.
 
+In the meantime, if you want to log parameters in your application, you can use
+the following snippet:
+
+```ruby
+# production.rb
+YourApp::Application.configure do
+  config.lograge.enabled = true
+  config.lograge.custom_options = lambda do |event|
+    params = event.payload[:params].reject do |k|
+      ['controller', 'action'].include? k
+    end
+
+    { "params" => params }
+  end
+end
+```
+
 **Changes**
 
 * Add support for Graylog2 events (Lennart Koopmann, http://github.com/lennartkoopmann)