Add tips about installing DebugKit plugin

Author: rchavik

en/developers/tips.rst

@@ -11,6 +11,22 @@ Croogo is shipped with debug level 1 enabled. You can disable it in `/app/Config
 
     Configure::write('debug', 0);
 
+DebugKit
+--------
+
+Install DebugKit into `Plugin/DebugKit`::
+
+    git clone http://github.com/cakephp/debug_kit Plugin/DebugKit
+
+Activate DebugKit plugin::
+
+    Console/cake ext activate plugin -f DebugKit
+
+Hook the ToolbarComponent to all controllers::
+
+    // Config/bootstrap.php
+    Croogo::hookComponent('*', 'DebugKit.Toolbar');
+
 Symlink plugin and theme assets
 -------------------------------