Merge pull request #2 from plashchynski/add_info_about_installation

add more info on how to setup

README.markdown

@@ -3,11 +3,33 @@
 Add an ability to [rails_admin](https://github.com/sferik/rails_admin) to impersonate as any user or actually any member
 that is devise authenticatable.
 
-Installation: just add to your Gemfile.
+## Installation
+
+Add to your Gemfile:
 
     gem 'rails_admin'
     gem 'rails_admin_impersonate'
 
+Add to your `config/initializers/rails_admin.rb` an action `impersonate` to actions:
+
+    config.actions do
+      # root actions
+      dashboard                     # mandatory
+      # collection actions
+      index                         # mandatory
+      new
+      export
+      history_index
+      bulk_delete
+      # member actions
+      show
+      edit
+      delete
+      history_show
+      show_in_app
+      impersonate
+    end
+
 You should see home icon and Impersonate link for every user action.
 
 This project rocks and uses MIT-LICENSE.